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fs/buffer.c
90.3 KB
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/* * linux/fs/buffer.c * * Copyright (C) 1991, 1992, 2002 Linus Torvalds */ /* * Start bdflush() with kernel_thread not syscall - Paul Gortmaker, 12/95 * * Removed a lot of unnecessary code and simplified things now that * the buffer cache isn't our primary cache - Andrew Tridgell 12/96 * * Speed up hash, lru, and free list operations. Use gfp() for allocating * hash table, use SLAB cache for buffer heads. SMP threading. -DaveM * * Added 32k buffer block sizes - these are required older ARM systems. - RMK * * async buffer flushing, 1999 Andrea Arcangeli <andrea@suse.de> */ |
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#include <linux/kernel.h> #include <linux/syscalls.h> #include <linux/fs.h> |
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#include <linux/iomap.h> |
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#include <linux/mm.h> #include <linux/percpu.h> #include <linux/slab.h> |
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#include <linux/capability.h> |
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#include <linux/blkdev.h> #include <linux/file.h> #include <linux/quotaops.h> #include <linux/highmem.h> |
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#include <linux/export.h> |
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#include <linux/backing-dev.h> |
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#include <linux/writeback.h> #include <linux/hash.h> #include <linux/suspend.h> #include <linux/buffer_head.h> |
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#include <linux/task_io_accounting_ops.h> |
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#include <linux/bio.h> #include <linux/notifier.h> #include <linux/cpu.h> #include <linux/bitops.h> #include <linux/mpage.h> |
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#include <linux/bit_spinlock.h> |
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#include <trace/events/block.h> |
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static int fsync_buffers_list(spinlock_t *lock, struct list_head *list); |
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static int submit_bh_wbc(int op, int op_flags, struct buffer_head *bh, |
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unsigned long bio_flags, struct writeback_control *wbc); |
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#define BH_ENTRY(list) list_entry((list), struct buffer_head, b_assoc_buffers) |
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void init_buffer(struct buffer_head *bh, bh_end_io_t *handler, void *private) |
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{ bh->b_end_io = handler; bh->b_private = private; } |
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EXPORT_SYMBOL(init_buffer); |
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|
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inline void touch_buffer(struct buffer_head *bh) { |
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trace_block_touch_buffer(bh); |
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mark_page_accessed(bh->b_page); } EXPORT_SYMBOL(touch_buffer); |
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void __lock_buffer(struct buffer_head *bh) |
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{ |
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wait_on_bit_lock_io(&bh->b_state, BH_Lock, TASK_UNINTERRUPTIBLE); |
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} EXPORT_SYMBOL(__lock_buffer); |
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void unlock_buffer(struct buffer_head *bh) |
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{ |
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clear_bit_unlock(BH_Lock, &bh->b_state); |
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smp_mb__after_atomic(); |
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wake_up_bit(&bh->b_state, BH_Lock); } |
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EXPORT_SYMBOL(unlock_buffer); |
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/* |
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* Returns if the page has dirty or writeback buffers. If all the buffers * are unlocked and clean then the PageDirty information is stale. If * any of the pages are locked, it is assumed they are locked for IO. */ void buffer_check_dirty_writeback(struct page *page, bool *dirty, bool *writeback) { struct buffer_head *head, *bh; *dirty = false; *writeback = false; BUG_ON(!PageLocked(page)); if (!page_has_buffers(page)) return; if (PageWriteback(page)) *writeback = true; head = page_buffers(page); bh = head; do { if (buffer_locked(bh)) *writeback = true; if (buffer_dirty(bh)) *dirty = true; bh = bh->b_this_page; } while (bh != head); } EXPORT_SYMBOL(buffer_check_dirty_writeback); /* |
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* Block until a buffer comes unlocked. This doesn't stop it * from becoming locked again - you have to lock it yourself * if you want to preserve its state. */ void __wait_on_buffer(struct buffer_head * bh) { |
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wait_on_bit_io(&bh->b_state, BH_Lock, TASK_UNINTERRUPTIBLE); |
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} |
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EXPORT_SYMBOL(__wait_on_buffer); |
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static void __clear_page_buffers(struct page *page) { ClearPagePrivate(page); |
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set_page_private(page, 0); |
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put_page(page); |
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} |
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static void buffer_io_error(struct buffer_head *bh, char *msg) |
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{ |
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if (!test_bit(BH_Quiet, &bh->b_state)) printk_ratelimited(KERN_ERR |
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"Buffer I/O error on dev %pg, logical block %llu%s ", bh->b_bdev, (unsigned long long)bh->b_blocknr, msg); |
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} /* |
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* End-of-IO handler helper function which does not touch the bh after * unlocking it. * Note: unlock_buffer() sort-of does touch the bh after unlocking it, but * a race there is benign: unlock_buffer() only use the bh's address for * hashing after unlocking the buffer, so it doesn't actually touch the bh * itself. |
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*/ |
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static void __end_buffer_read_notouch(struct buffer_head *bh, int uptodate) |
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{ if (uptodate) { set_buffer_uptodate(bh); } else { |
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/* This happens, due to failed read-ahead attempts. */ |
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clear_buffer_uptodate(bh); } unlock_buffer(bh); |
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} /* * Default synchronous end-of-IO handler.. Just mark it up-to-date and * unlock the buffer. This is what ll_rw_block uses too. */ void end_buffer_read_sync(struct buffer_head *bh, int uptodate) { __end_buffer_read_notouch(bh, uptodate); |
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put_bh(bh); } |
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EXPORT_SYMBOL(end_buffer_read_sync); |
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void end_buffer_write_sync(struct buffer_head *bh, int uptodate) { |
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if (uptodate) { set_buffer_uptodate(bh); } else { |
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buffer_io_error(bh, ", lost sync page write"); |
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set_buffer_write_io_error(bh); clear_buffer_uptodate(bh); } unlock_buffer(bh); put_bh(bh); } |
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EXPORT_SYMBOL(end_buffer_write_sync); |
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/* |
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* Various filesystems appear to want __find_get_block to be non-blocking. * But it's the page lock which protects the buffers. To get around this, * we get exclusion from try_to_free_buffers with the blockdev mapping's * private_lock. * * Hack idea: for the blockdev mapping, i_bufferlist_lock contention * may be quite high. This code could TryLock the page, and if that * succeeds, there is no need to take private_lock. (But if * private_lock is contended then so is mapping->tree_lock). */ static struct buffer_head * |
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__find_get_block_slow(struct block_device *bdev, sector_t block) |
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{ struct inode *bd_inode = bdev->bd_inode; struct address_space *bd_mapping = bd_inode->i_mapping; struct buffer_head *ret = NULL; pgoff_t index; struct buffer_head *bh; struct buffer_head *head; struct page *page; int all_mapped = 1; |
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index = block >> (PAGE_SHIFT - bd_inode->i_blkbits); |
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page = find_get_page_flags(bd_mapping, index, FGP_ACCESSED); |
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if (!page) goto out; spin_lock(&bd_mapping->private_lock); if (!page_has_buffers(page)) goto out_unlock; head = page_buffers(page); bh = head; do { |
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if (!buffer_mapped(bh)) all_mapped = 0; else if (bh->b_blocknr == block) { |
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ret = bh; get_bh(bh); goto out_unlock; } |
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bh = bh->b_this_page; } while (bh != head); /* we might be here because some of the buffers on this page are * not mapped. This is due to various races between * file io on the block device and getblk. It gets dealt with * elsewhere, don't buffer_error if we had some unmapped buffers */ if (all_mapped) { printk("__find_get_block_slow() failed. " "block=%llu, b_blocknr=%llu ", |
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(unsigned long long)block, (unsigned long long)bh->b_blocknr); printk("b_state=0x%08lx, b_size=%zu ", bh->b_state, bh->b_size); |
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printk("device %pg blocksize: %d ", bdev, |
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1 << bd_inode->i_blkbits); |
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} out_unlock: spin_unlock(&bd_mapping->private_lock); |
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put_page(page); |
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out: return ret; } |
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/* |
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* Kick the writeback threads then try to free up some ZONE_NORMAL memory. |
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*/ static void free_more_memory(void) { |
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struct zoneref *z; |
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int nid; |
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|
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wakeup_flusher_threads(1024, WB_REASON_FREE_MORE_MEM); |
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yield(); |
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for_each_online_node(nid) { |
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z = first_zones_zonelist(node_zonelist(nid, GFP_NOFS), gfp_zone(GFP_NOFS), NULL); if (z->zone) |
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try_to_free_pages(node_zonelist(nid, GFP_NOFS), 0, |
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GFP_NOFS, NULL); |
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} } /* * I/O completion handler for block_read_full_page() - pages * which come unlocked at the end of I/O. */ static void end_buffer_async_read(struct buffer_head *bh, int uptodate) { |
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unsigned long flags; |
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struct buffer_head *first; |
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struct buffer_head *tmp; struct page *page; int page_uptodate = 1; BUG_ON(!buffer_async_read(bh)); page = bh->b_page; if (uptodate) { set_buffer_uptodate(bh); } else { clear_buffer_uptodate(bh); |
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buffer_io_error(bh, ", async page read"); |
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SetPageError(page); } /* * Be _very_ careful from here on. Bad things can happen if * two buffer heads end IO at almost the same time and both * decide that the page is now completely done. */ |
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first = page_buffers(page); local_irq_save(flags); bit_spin_lock(BH_Uptodate_Lock, &first->b_state); |
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clear_buffer_async_read(bh); unlock_buffer(bh); tmp = bh; do { if (!buffer_uptodate(tmp)) page_uptodate = 0; if (buffer_async_read(tmp)) { BUG_ON(!buffer_locked(tmp)); goto still_busy; } tmp = tmp->b_this_page; } while (tmp != bh); |
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bit_spin_unlock(BH_Uptodate_Lock, &first->b_state); local_irq_restore(flags); |
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/* * If none of the buffers had errors and they are all * uptodate then we can set the page uptodate. */ if (page_uptodate && !PageError(page)) SetPageUptodate(page); unlock_page(page); return; still_busy: |
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bit_spin_unlock(BH_Uptodate_Lock, &first->b_state); local_irq_restore(flags); |
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return; } /* * Completion handler for block_write_full_page() - pages which are unlocked * during I/O, and which have PageWriteback cleared upon I/O completion. */ |
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void end_buffer_async_write(struct buffer_head *bh, int uptodate) |
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{ |
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unsigned long flags; |
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struct buffer_head *first; |
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struct buffer_head *tmp; struct page *page; BUG_ON(!buffer_async_write(bh)); page = bh->b_page; if (uptodate) { set_buffer_uptodate(bh); } else { |
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buffer_io_error(bh, ", lost async page write"); |
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mapping_set_error(page->mapping, -EIO); |
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set_buffer_write_io_error(bh); |
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clear_buffer_uptodate(bh); SetPageError(page); } |
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first = page_buffers(page); local_irq_save(flags); bit_spin_lock(BH_Uptodate_Lock, &first->b_state); |
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clear_buffer_async_write(bh); unlock_buffer(bh); tmp = bh->b_this_page; while (tmp != bh) { if (buffer_async_write(tmp)) { BUG_ON(!buffer_locked(tmp)); goto still_busy; } tmp = tmp->b_this_page; } |
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bit_spin_unlock(BH_Uptodate_Lock, &first->b_state); local_irq_restore(flags); |
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end_page_writeback(page); return; still_busy: |
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bit_spin_unlock(BH_Uptodate_Lock, &first->b_state); local_irq_restore(flags); |
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return; } |
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EXPORT_SYMBOL(end_buffer_async_write); |
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/* * If a page's buffers are under async readin (end_buffer_async_read * completion) then there is a possibility that another thread of * control could lock one of the buffers after it has completed * but while some of the other buffers have not completed. This * locked buffer would confuse end_buffer_async_read() into not unlocking * the page. So the absence of BH_Async_Read tells end_buffer_async_read() * that this buffer is not under async I/O. * * The page comes unlocked when it has no locked buffer_async buffers * left. * * PageLocked prevents anyone starting new async I/O reads any of * the buffers. * * PageWriteback is used to prevent simultaneous writeout of the same * page. * * PageLocked prevents anyone from starting writeback of a page which is * under read I/O (PageWriteback is only ever set against a locked page). */ static void mark_buffer_async_read(struct buffer_head *bh) { bh->b_end_io = end_buffer_async_read; set_buffer_async_read(bh); } |
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static void mark_buffer_async_write_endio(struct buffer_head *bh, bh_end_io_t *handler) |
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{ |
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bh->b_end_io = handler; |
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set_buffer_async_write(bh); } |
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void mark_buffer_async_write(struct buffer_head *bh) { mark_buffer_async_write_endio(bh, end_buffer_async_write); } |
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EXPORT_SYMBOL(mark_buffer_async_write); /* * fs/buffer.c contains helper functions for buffer-backed address space's * fsync functions. A common requirement for buffer-based filesystems is * that certain data from the backing blockdev needs to be written out for * a successful fsync(). For example, ext2 indirect blocks need to be * written back and waited upon before fsync() returns. * * The functions mark_buffer_inode_dirty(), fsync_inode_buffers(), * inode_has_buffers() and invalidate_inode_buffers() are provided for the * management of a list of dependent buffers at ->i_mapping->private_list. * * Locking is a little subtle: try_to_free_buffers() will remove buffers * from their controlling inode's queue when they are being freed. But * try_to_free_buffers() will be operating against the *blockdev* mapping * at the time, not against the S_ISREG file which depends on those buffers. * So the locking for private_list is via the private_lock in the address_space * which backs the buffers. Which is different from the address_space * against which the buffers are listed. So for a particular address_space, * mapping->private_lock does *not* protect mapping->private_list! In fact, * mapping->private_list will always be protected by the backing blockdev's * ->private_lock. * * Which introduces a requirement: all buffers on an address_space's * ->private_list must be from the same address_space: the blockdev's. * * address_spaces which do not place buffers at ->private_list via these * utility functions are free to use private_lock and private_list for * whatever they want. The only requirement is that list_empty(private_list) * be true at clear_inode() time. * * FIXME: clear_inode should not call invalidate_inode_buffers(). The * filesystems should do that. invalidate_inode_buffers() should just go * BUG_ON(!list_empty). * * FIXME: mark_buffer_dirty_inode() is a data-plane operation. It should * take an address_space, not an inode. And it should be called * mark_buffer_dirty_fsync() to clearly define why those buffers are being * queued up. * * FIXME: mark_buffer_dirty_inode() doesn't need to add the buffer to the * list if it is already on a list. Because if the buffer is on a list, * it *must* already be on the right one. If not, the filesystem is being * silly. This will save a ton of locking. But first we have to ensure * that buffers are taken *off* the old inode's list when they are freed * (presumably in truncate). That requires careful auditing of all * filesystems (do it inside bforget()). It could also be done by bringing * b_inode back. */ /* * The buffer's backing address_space's private_lock must be held */ |
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static void __remove_assoc_queue(struct buffer_head *bh) |
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{ list_del_init(&bh->b_assoc_buffers); |
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WARN_ON(!bh->b_assoc_map); if (buffer_write_io_error(bh)) set_bit(AS_EIO, &bh->b_assoc_map->flags); bh->b_assoc_map = NULL; |
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} int inode_has_buffers(struct inode *inode) { return !list_empty(&inode->i_data.private_list); } /* * osync is designed to support O_SYNC io. It waits synchronously for * all already-submitted IO to complete, but does not queue any new * writes to the disk. * * To do O_SYNC writes, just queue the buffer writes with ll_rw_block as * you dirty the buffers, and then use osync_inode_buffers to wait for * completion. Any other dirty buffers which are not yet queued for * write will not be flushed to disk by the osync. */ static int osync_buffers_list(spinlock_t *lock, struct list_head *list) { struct buffer_head *bh; struct list_head *p; int err = 0; spin_lock(lock); repeat: list_for_each_prev(p, list) { bh = BH_ENTRY(p); if (buffer_locked(bh)) { get_bh(bh); spin_unlock(lock); wait_on_buffer(bh); if (!buffer_uptodate(bh)) err = -EIO; brelse(bh); spin_lock(lock); goto repeat; } } spin_unlock(lock); return err; } |
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static void do_thaw_one(struct super_block *sb, void *unused) |
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{ |
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while (sb->s_bdev && !thaw_bdev(sb->s_bdev, sb)) |
a1c6f0573 fs: use block_dev... |
523 524 |
printk(KERN_WARNING "Emergency Thaw on %pg ", sb->s_bdev); |
01a05b337 new helper: itera... |
525 |
} |
c2d754385 filesystem freeze... |
526 |
|
01a05b337 new helper: itera... |
527 528 529 |
static void do_thaw_all(struct work_struct *work) { iterate_supers(do_thaw_one, NULL); |
053c525fc buffer: switch do... |
530 |
kfree(work); |
c2d754385 filesystem freeze... |
531 532 533 534 535 536 537 538 539 540 541 |
printk(KERN_WARNING "Emergency Thaw complete "); } /** * emergency_thaw_all -- forcibly thaw every frozen filesystem * * Used for emergency unfreeze of all filesystems via SysRq */ void emergency_thaw_all(void) { |
053c525fc buffer: switch do... |
542 543 544 545 546 547 548 |
struct work_struct *work; work = kmalloc(sizeof(*work), GFP_ATOMIC); if (work) { INIT_WORK(work, do_thaw_all); schedule_work(work); } |
c2d754385 filesystem freeze... |
549 |
} |
1da177e4c Linux-2.6.12-rc2 |
550 |
/** |
78a4a50a8 docbook: fix file... |
551 |
* sync_mapping_buffers - write out & wait upon a mapping's "associated" buffers |
67be2dd1b [PATCH] DocBook: ... |
552 |
* @mapping: the mapping which wants those buffers written |
1da177e4c Linux-2.6.12-rc2 |
553 554 555 556 |
* * Starts I/O against the buffers at mapping->private_list, and waits upon * that I/O. * |
67be2dd1b [PATCH] DocBook: ... |
557 558 559 |
* Basically, this is a convenience function for fsync(). * @mapping is a file or directory which needs those buffers to be written for * a successful fsync(). |
1da177e4c Linux-2.6.12-rc2 |
560 561 562 |
*/ int sync_mapping_buffers(struct address_space *mapping) { |
252aa6f5b mm: redefine addr... |
563 |
struct address_space *buffer_mapping = mapping->private_data; |
1da177e4c Linux-2.6.12-rc2 |
564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 |
if (buffer_mapping == NULL || list_empty(&mapping->private_list)) return 0; return fsync_buffers_list(&buffer_mapping->private_lock, &mapping->private_list); } EXPORT_SYMBOL(sync_mapping_buffers); /* * Called when we've recently written block `bblock', and it is known that * `bblock' was for a buffer_boundary() buffer. This means that the block at * `bblock + 1' is probably a dirty indirect block. Hunt it down and, if it's * dirty, schedule it for IO. So that indirects merge nicely with their data. */ void write_boundary_block(struct block_device *bdev, sector_t bblock, unsigned blocksize) { struct buffer_head *bh = __find_get_block(bdev, bblock + 1, blocksize); if (bh) { if (buffer_dirty(bh)) |
dfec8a14f fs: have ll_rw_bl... |
585 |
ll_rw_block(REQ_OP_WRITE, 0, 1, &bh); |
1da177e4c Linux-2.6.12-rc2 |
586 587 588 589 590 591 592 593 594 595 |
put_bh(bh); } } void mark_buffer_dirty_inode(struct buffer_head *bh, struct inode *inode) { struct address_space *mapping = inode->i_mapping; struct address_space *buffer_mapping = bh->b_page->mapping; mark_buffer_dirty(bh); |
252aa6f5b mm: redefine addr... |
596 597 |
if (!mapping->private_data) { mapping->private_data = buffer_mapping; |
1da177e4c Linux-2.6.12-rc2 |
598 |
} else { |
252aa6f5b mm: redefine addr... |
599 |
BUG_ON(mapping->private_data != buffer_mapping); |
1da177e4c Linux-2.6.12-rc2 |
600 |
} |
535ee2fbf buffer_head: fix ... |
601 |
if (!bh->b_assoc_map) { |
1da177e4c Linux-2.6.12-rc2 |
602 603 604 |
spin_lock(&buffer_mapping->private_lock); list_move_tail(&bh->b_assoc_buffers, &mapping->private_list); |
58ff407be [PATCH] Fix IO er... |
605 |
bh->b_assoc_map = mapping; |
1da177e4c Linux-2.6.12-rc2 |
606 607 608 609 610 611 |
spin_unlock(&buffer_mapping->private_lock); } } EXPORT_SYMBOL(mark_buffer_dirty_inode); /* |
787d2214c fs: introduce som... |
612 613 614 615 616 |
* Mark the page dirty, and set it dirty in the radix tree, and mark the inode * dirty. * * If warn is true, then emit a warning if the page is not uptodate and has * not been truncated. |
c4843a759 memcg: add per cg... |
617 |
* |
81f8c3a46 mm: memcontrol: g... |
618 |
* The caller must hold lock_page_memcg(). |
787d2214c fs: introduce som... |
619 |
*/ |
c4843a759 memcg: add per cg... |
620 |
static void __set_page_dirty(struct page *page, struct address_space *mapping, |
62cccb8c8 mm: simplify lock... |
621 |
int warn) |
787d2214c fs: introduce som... |
622 |
{ |
227d53b39 mm: __set_page_di... |
623 624 625 |
unsigned long flags; spin_lock_irqsave(&mapping->tree_lock, flags); |
787d2214c fs: introduce som... |
626 627 |
if (page->mapping) { /* Race with truncate? */ WARN_ON_ONCE(warn && !PageUptodate(page)); |
62cccb8c8 mm: simplify lock... |
628 |
account_page_dirtied(page, mapping); |
787d2214c fs: introduce som... |
629 630 631 |
radix_tree_tag_set(&mapping->page_tree, page_index(page), PAGECACHE_TAG_DIRTY); } |
227d53b39 mm: __set_page_di... |
632 |
spin_unlock_irqrestore(&mapping->tree_lock, flags); |
787d2214c fs: introduce som... |
633 634 635 |
} /* |
1da177e4c Linux-2.6.12-rc2 |
636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 |
* Add a page to the dirty page list. * * It is a sad fact of life that this function is called from several places * deeply under spinlocking. It may not sleep. * * If the page has buffers, the uptodate buffers are set dirty, to preserve * dirty-state coherency between the page and the buffers. It the page does * not have buffers then when they are later attached they will all be set * dirty. * * The buffers are dirtied before the page is dirtied. There's a small race * window in which a writepage caller may see the page cleanness but not the * buffer dirtiness. That's fine. If this code were to set the page dirty * before the buffers, a concurrent writepage caller could clear the page dirty * bit, see a bunch of clean buffers and we'd end up with dirty buffers/clean * page on the dirty page list. * * We use private_lock to lock against try_to_free_buffers while using the * page's buffer list. Also use this to protect against clean buffers being * added to the page after it was set dirty. * * FIXME: may need to call ->reservepage here as well. That's rather up to the * address_space though. */ int __set_page_dirty_buffers(struct page *page) { |
a8e7d49aa Fix race in creat... |
662 |
int newly_dirty; |
787d2214c fs: introduce som... |
663 |
struct address_space *mapping = page_mapping(page); |
ebf7a227d [PATCH] mm: bug i... |
664 665 666 |
if (unlikely(!mapping)) return !TestSetPageDirty(page); |
1da177e4c Linux-2.6.12-rc2 |
667 668 669 670 671 672 673 674 675 676 677 |
spin_lock(&mapping->private_lock); if (page_has_buffers(page)) { struct buffer_head *head = page_buffers(page); struct buffer_head *bh = head; do { set_buffer_dirty(bh); bh = bh->b_this_page; } while (bh != head); } |
c4843a759 memcg: add per cg... |
678 |
/* |
81f8c3a46 mm: memcontrol: g... |
679 680 |
* Lock out page->mem_cgroup migration to keep PageDirty * synchronized with per-memcg dirty page counters. |
c4843a759 memcg: add per cg... |
681 |
*/ |
62cccb8c8 mm: simplify lock... |
682 |
lock_page_memcg(page); |
a8e7d49aa Fix race in creat... |
683 |
newly_dirty = !TestSetPageDirty(page); |
1da177e4c Linux-2.6.12-rc2 |
684 |
spin_unlock(&mapping->private_lock); |
a8e7d49aa Fix race in creat... |
685 |
if (newly_dirty) |
62cccb8c8 mm: simplify lock... |
686 |
__set_page_dirty(page, mapping, 1); |
c4843a759 memcg: add per cg... |
687 |
|
62cccb8c8 mm: simplify lock... |
688 |
unlock_page_memcg(page); |
c4843a759 memcg: add per cg... |
689 690 691 |
if (newly_dirty) __mark_inode_dirty(mapping->host, I_DIRTY_PAGES); |
a8e7d49aa Fix race in creat... |
692 |
return newly_dirty; |
1da177e4c Linux-2.6.12-rc2 |
693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 |
} EXPORT_SYMBOL(__set_page_dirty_buffers); /* * Write out and wait upon a list of buffers. * * We have conflicting pressures: we want to make sure that all * initially dirty buffers get waited on, but that any subsequently * dirtied buffers don't. After all, we don't want fsync to last * forever if somebody is actively writing to the file. * * Do this in two main stages: first we copy dirty buffers to a * temporary inode list, queueing the writes as we go. Then we clean * up, waiting for those writes to complete. * * During this second stage, any subsequent updates to the file may end * up refiling the buffer on the original inode's dirty list again, so * there is a chance we will end up with a buffer queued for write but * not yet completed on that list. So, as a final cleanup we go through * the osync code to catch these locked, dirty buffers without requeuing * any newly dirty buffers for write. */ static int fsync_buffers_list(spinlock_t *lock, struct list_head *list) { struct buffer_head *bh; struct list_head tmp; |
7eaceacca block: remove per... |
719 |
struct address_space *mapping; |
1da177e4c Linux-2.6.12-rc2 |
720 |
int err = 0, err2; |
4ee2491ed fs: make fsync_bu... |
721 |
struct blk_plug plug; |
1da177e4c Linux-2.6.12-rc2 |
722 723 |
INIT_LIST_HEAD(&tmp); |
4ee2491ed fs: make fsync_bu... |
724 |
blk_start_plug(&plug); |
1da177e4c Linux-2.6.12-rc2 |
725 726 727 728 |
spin_lock(lock); while (!list_empty(list)) { bh = BH_ENTRY(list->next); |
535ee2fbf buffer_head: fix ... |
729 |
mapping = bh->b_assoc_map; |
58ff407be [PATCH] Fix IO er... |
730 |
__remove_assoc_queue(bh); |
535ee2fbf buffer_head: fix ... |
731 732 733 |
/* Avoid race with mark_buffer_dirty_inode() which does * a lockless check and we rely on seeing the dirty bit */ smp_mb(); |
1da177e4c Linux-2.6.12-rc2 |
734 735 |
if (buffer_dirty(bh) || buffer_locked(bh)) { list_add(&bh->b_assoc_buffers, &tmp); |
535ee2fbf buffer_head: fix ... |
736 |
bh->b_assoc_map = mapping; |
1da177e4c Linux-2.6.12-rc2 |
737 738 739 740 741 |
if (buffer_dirty(bh)) { get_bh(bh); spin_unlock(lock); /* * Ensure any pending I/O completes so that |
9cb569d60 remove SWRITE* I/... |
742 743 744 745 |
* write_dirty_buffer() actually writes the * current contents - it is a noop if I/O is * still in flight on potentially older * contents. |
1da177e4c Linux-2.6.12-rc2 |
746 |
*/ |
721a9602e block: kill off R... |
747 |
write_dirty_buffer(bh, WRITE_SYNC); |
9cf6b720f block: fsync_buff... |
748 749 750 751 752 753 754 |
/* * Kick off IO for the previous mapping. Note * that we will not run the very last mapping, * wait_on_buffer() will do that for us * through sync_buffer(). */ |
1da177e4c Linux-2.6.12-rc2 |
755 756 757 758 759 |
brelse(bh); spin_lock(lock); } } } |
4ee2491ed fs: make fsync_bu... |
760 761 762 |
spin_unlock(lock); blk_finish_plug(&plug); spin_lock(lock); |
1da177e4c Linux-2.6.12-rc2 |
763 764 |
while (!list_empty(&tmp)) { bh = BH_ENTRY(tmp.prev); |
1da177e4c Linux-2.6.12-rc2 |
765 |
get_bh(bh); |
535ee2fbf buffer_head: fix ... |
766 767 768 769 770 771 772 |
mapping = bh->b_assoc_map; __remove_assoc_queue(bh); /* Avoid race with mark_buffer_dirty_inode() which does * a lockless check and we rely on seeing the dirty bit */ smp_mb(); if (buffer_dirty(bh)) { list_add(&bh->b_assoc_buffers, |
e3892296d vfs: fix NULL poi... |
773 |
&mapping->private_list); |
535ee2fbf buffer_head: fix ... |
774 775 |
bh->b_assoc_map = mapping; } |
1da177e4c Linux-2.6.12-rc2 |
776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 |
spin_unlock(lock); wait_on_buffer(bh); if (!buffer_uptodate(bh)) err = -EIO; brelse(bh); spin_lock(lock); } spin_unlock(lock); err2 = osync_buffers_list(lock, list); if (err) return err; else return err2; } /* * Invalidate any and all dirty buffers on a given inode. We are * probably unmounting the fs, but that doesn't mean we have already * done a sync(). Just drop the buffers from the inode list. * * NOTE: we take the inode's blockdev's mapping's private_lock. Which * assumes that all the buffers are against the blockdev. Not true * for reiserfs. */ void invalidate_inode_buffers(struct inode *inode) { if (inode_has_buffers(inode)) { struct address_space *mapping = &inode->i_data; struct list_head *list = &mapping->private_list; |
252aa6f5b mm: redefine addr... |
806 |
struct address_space *buffer_mapping = mapping->private_data; |
1da177e4c Linux-2.6.12-rc2 |
807 808 809 810 811 812 813 |
spin_lock(&buffer_mapping->private_lock); while (!list_empty(list)) __remove_assoc_queue(BH_ENTRY(list->next)); spin_unlock(&buffer_mapping->private_lock); } } |
52b19ac99 udf: Fix BUG_ON()... |
814 |
EXPORT_SYMBOL(invalidate_inode_buffers); |
1da177e4c Linux-2.6.12-rc2 |
815 816 817 818 819 820 821 822 823 824 825 826 827 828 |
/* * Remove any clean buffers from the inode's buffer list. This is called * when we're trying to free the inode itself. Those buffers can pin it. * * Returns true if all buffers were removed. */ int remove_inode_buffers(struct inode *inode) { int ret = 1; if (inode_has_buffers(inode)) { struct address_space *mapping = &inode->i_data; struct list_head *list = &mapping->private_list; |
252aa6f5b mm: redefine addr... |
829 |
struct address_space *buffer_mapping = mapping->private_data; |
1da177e4c Linux-2.6.12-rc2 |
830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 |
spin_lock(&buffer_mapping->private_lock); while (!list_empty(list)) { struct buffer_head *bh = BH_ENTRY(list->next); if (buffer_dirty(bh)) { ret = 0; break; } __remove_assoc_queue(bh); } spin_unlock(&buffer_mapping->private_lock); } return ret; } /* * Create the appropriate buffers when given a page for data area and * the size of each buffer.. Use the bh->b_this_page linked list to * follow the buffers created. Return NULL if unable to create more * buffers. * * The retry flag is used to differentiate async IO (paging, swapping) * which may not fail from ordinary buffer allocations. */ struct buffer_head *alloc_page_buffers(struct page *page, unsigned long size, int retry) { struct buffer_head *bh, *head; long offset; try_again: head = NULL; offset = PAGE_SIZE; while ((offset -= size) >= 0) { bh = alloc_buffer_head(GFP_NOFS); if (!bh) goto no_grow; |
1da177e4c Linux-2.6.12-rc2 |
867 868 869 |
bh->b_this_page = head; bh->b_blocknr = -1; head = bh; |
1da177e4c Linux-2.6.12-rc2 |
870 871 872 873 |
bh->b_size = size; /* Link the buffer to its page */ set_bh_page(bh, page, offset); |
1da177e4c Linux-2.6.12-rc2 |
874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 |
} return head; /* * In case anything failed, we just free everything we got. */ no_grow: if (head) { do { bh = head; head = head->b_this_page; free_buffer_head(bh); } while (head); } /* * Return failure for non-async IO requests. Async IO requests * are not allowed to fail, so we have to wait until buffer heads * become available. But we don't want tasks sleeping with * partially complete buffers, so all were released above. */ if (!retry) return NULL; /* We're _really_ low on memory. Now we just * wait for old buffer heads to become free due to * finishing IO. Since this is an async request and * the reserve list is empty, we're sure there are * async buffer heads in use. */ free_more_memory(); goto try_again; } EXPORT_SYMBOL_GPL(alloc_page_buffers); static inline void link_dev_buffers(struct page *page, struct buffer_head *head) { struct buffer_head *bh, *tail; bh = head; do { tail = bh; bh = bh->b_this_page; } while (bh); tail->b_this_page = head; attach_page_buffers(page, head); } |
bbec0270b blkdev_max_block:... |
921 922 923 924 925 926 927 928 929 930 931 |
static sector_t blkdev_max_block(struct block_device *bdev, unsigned int size) { sector_t retval = ~((sector_t)0); loff_t sz = i_size_read(bdev->bd_inode); if (sz) { unsigned int sizebits = blksize_bits(size); retval = (sz >> sizebits); } return retval; } |
1da177e4c Linux-2.6.12-rc2 |
932 933 934 |
/* * Initialise the state of a blockdev page's buffers. */ |
676ce6d5c block: replace __... |
935 |
static sector_t |
1da177e4c Linux-2.6.12-rc2 |
936 937 938 939 940 941 |
init_page_buffers(struct page *page, struct block_device *bdev, sector_t block, int size) { struct buffer_head *head = page_buffers(page); struct buffer_head *bh = head; int uptodate = PageUptodate(page); |
bbec0270b blkdev_max_block:... |
942 |
sector_t end_block = blkdev_max_block(I_BDEV(bdev->bd_inode), size); |
1da177e4c Linux-2.6.12-rc2 |
943 944 945 946 947 948 949 950 |
do { if (!buffer_mapped(bh)) { init_buffer(bh, NULL, NULL); bh->b_bdev = bdev; bh->b_blocknr = block; if (uptodate) set_buffer_uptodate(bh); |
080399aaa block: don't mark... |
951 952 |
if (block < end_block) set_buffer_mapped(bh); |
1da177e4c Linux-2.6.12-rc2 |
953 954 955 956 |
} block++; bh = bh->b_this_page; } while (bh != head); |
676ce6d5c block: replace __... |
957 958 959 960 961 |
/* * Caller needs to validate requested block against end of device. */ return end_block; |
1da177e4c Linux-2.6.12-rc2 |
962 963 964 965 966 |
} /* * Create the page-cache page that contains the requested block. * |
676ce6d5c block: replace __... |
967 |
* This is used purely for blockdev mappings. |
1da177e4c Linux-2.6.12-rc2 |
968 |
*/ |
676ce6d5c block: replace __... |
969 |
static int |
1da177e4c Linux-2.6.12-rc2 |
970 |
grow_dev_page(struct block_device *bdev, sector_t block, |
3b5e6454a fs/buffer.c: supp... |
971 |
pgoff_t index, int size, int sizebits, gfp_t gfp) |
1da177e4c Linux-2.6.12-rc2 |
972 973 974 975 |
{ struct inode *inode = bdev->bd_inode; struct page *page; struct buffer_head *bh; |
676ce6d5c block: replace __... |
976 977 |
sector_t end_block; int ret = 0; /* Will call free_more_memory() */ |
84235de39 fs: buffer: move ... |
978 |
gfp_t gfp_mask; |
1da177e4c Linux-2.6.12-rc2 |
979 |
|
c62d25556 mm, fs: introduce... |
980 |
gfp_mask = mapping_gfp_constraint(inode->i_mapping, ~__GFP_FS) | gfp; |
3b5e6454a fs/buffer.c: supp... |
981 |
|
84235de39 fs: buffer: move ... |
982 983 984 985 986 987 988 989 990 |
/* * XXX: __getblk_slow() can not really deal with failure and * will endlessly loop on improvised global reclaim. Prefer * looping in the allocator rather than here, at least that * code knows what it's doing. */ gfp_mask |= __GFP_NOFAIL; page = find_or_create_page(inode->i_mapping, index, gfp_mask); |
1da177e4c Linux-2.6.12-rc2 |
991 |
if (!page) |
676ce6d5c block: replace __... |
992 |
return ret; |
1da177e4c Linux-2.6.12-rc2 |
993 |
|
e827f9235 BUG_ON() Conversi... |
994 |
BUG_ON(!PageLocked(page)); |
1da177e4c Linux-2.6.12-rc2 |
995 996 997 998 |
if (page_has_buffers(page)) { bh = page_buffers(page); if (bh->b_size == size) { |
676ce6d5c block: replace __... |
999 |
end_block = init_page_buffers(page, bdev, |
f2d5a9443 Fix nasty 32-bit ... |
1000 1001 |
(sector_t)index << sizebits, size); |
676ce6d5c block: replace __... |
1002 |
goto done; |
1da177e4c Linux-2.6.12-rc2 |
1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 |
} if (!try_to_free_buffers(page)) goto failed; } /* * Allocate some buffers for this page */ bh = alloc_page_buffers(page, size, 0); if (!bh) goto failed; /* * Link the page to the buffers and initialise them. Take the * lock to be atomic wrt __find_get_block(), which does not * run under the page lock. */ spin_lock(&inode->i_mapping->private_lock); link_dev_buffers(page, bh); |
f2d5a9443 Fix nasty 32-bit ... |
1022 1023 |
end_block = init_page_buffers(page, bdev, (sector_t)index << sizebits, size); |
1da177e4c Linux-2.6.12-rc2 |
1024 |
spin_unlock(&inode->i_mapping->private_lock); |
676ce6d5c block: replace __... |
1025 1026 |
done: ret = (block < end_block) ? 1 : -ENXIO; |
1da177e4c Linux-2.6.12-rc2 |
1027 |
failed: |
1da177e4c Linux-2.6.12-rc2 |
1028 |
unlock_page(page); |
09cbfeaf1 mm, fs: get rid o... |
1029 |
put_page(page); |
676ce6d5c block: replace __... |
1030 |
return ret; |
1da177e4c Linux-2.6.12-rc2 |
1031 1032 1033 1034 1035 |
} /* * Create buffers for the specified block device block's page. If * that page was dirty, the buffers are set dirty also. |
1da177e4c Linux-2.6.12-rc2 |
1036 |
*/ |
858119e15 [PATCH] Unlinline... |
1037 |
static int |
3b5e6454a fs/buffer.c: supp... |
1038 |
grow_buffers(struct block_device *bdev, sector_t block, int size, gfp_t gfp) |
1da177e4c Linux-2.6.12-rc2 |
1039 |
{ |
1da177e4c Linux-2.6.12-rc2 |
1040 1041 1042 1043 1044 1045 1046 1047 1048 |
pgoff_t index; int sizebits; sizebits = -1; do { sizebits++; } while ((size << sizebits) < PAGE_SIZE); index = block >> sizebits; |
1da177e4c Linux-2.6.12-rc2 |
1049 |
|
e56579338 [PATCH] grow_buff... |
1050 1051 1052 1053 1054 |
/* * Check for a block which wants to lie outside our maximum possible * pagecache index. (this comparison is done using sector_t types). */ if (unlikely(index != block >> sizebits)) { |
e56579338 [PATCH] grow_buff... |
1055 |
printk(KERN_ERR "%s: requested out-of-range block %llu for " |
a1c6f0573 fs: use block_dev... |
1056 1057 |
"device %pg ", |
8e24eea72 fs: replace remai... |
1058 |
__func__, (unsigned long long)block, |
a1c6f0573 fs: use block_dev... |
1059 |
bdev); |
e56579338 [PATCH] grow_buff... |
1060 1061 |
return -EIO; } |
676ce6d5c block: replace __... |
1062 |
|
1da177e4c Linux-2.6.12-rc2 |
1063 |
/* Create a page with the proper size buffers.. */ |
3b5e6454a fs/buffer.c: supp... |
1064 |
return grow_dev_page(bdev, block, index, size, sizebits, gfp); |
1da177e4c Linux-2.6.12-rc2 |
1065 |
} |
0026ba400 fs/buffer.c: make... |
1066 |
static struct buffer_head * |
3b5e6454a fs/buffer.c: supp... |
1067 1068 |
__getblk_slow(struct block_device *bdev, sector_t block, unsigned size, gfp_t gfp) |
1da177e4c Linux-2.6.12-rc2 |
1069 1070 |
{ /* Size must be multiple of hard sectorsize */ |
e1defc4ff block: Do away wi... |
1071 |
if (unlikely(size & (bdev_logical_block_size(bdev)-1) || |
1da177e4c Linux-2.6.12-rc2 |
1072 1073 1074 1075 |
(size < 512 || size > PAGE_SIZE))) { printk(KERN_ERR "getblk(): invalid block size %d requested ", size); |
e1defc4ff block: Do away wi... |
1076 1077 1078 |
printk(KERN_ERR "logical block size: %d ", bdev_logical_block_size(bdev)); |
1da177e4c Linux-2.6.12-rc2 |
1079 1080 1081 1082 |
dump_stack(); return NULL; } |
676ce6d5c block: replace __... |
1083 1084 1085 |
for (;;) { struct buffer_head *bh; int ret; |
1da177e4c Linux-2.6.12-rc2 |
1086 1087 1088 1089 |
bh = __find_get_block(bdev, block, size); if (bh) return bh; |
676ce6d5c block: replace __... |
1090 |
|
3b5e6454a fs/buffer.c: supp... |
1091 |
ret = grow_buffers(bdev, block, size, gfp); |
676ce6d5c block: replace __... |
1092 1093 1094 1095 |
if (ret < 0) return NULL; if (ret == 0) free_more_memory(); |
1da177e4c Linux-2.6.12-rc2 |
1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 |
} } /* * The relationship between dirty buffers and dirty pages: * * Whenever a page has any dirty buffers, the page's dirty bit is set, and * the page is tagged dirty in its radix tree. * * At all times, the dirtiness of the buffers represents the dirtiness of * subsections of the page. If the page has buffers, the page dirty bit is * merely a hint about the true dirty state. * * When a page is set dirty in its entirety, all its buffers are marked dirty * (if the page has buffers). * * When a buffer is marked dirty, its page is dirtied, but the page's other * buffers are not. * * Also. When blockdev buffers are explicitly read with bread(), they * individually become uptodate. But their backing page remains not * uptodate - even if all of its buffers are uptodate. A subsequent * block_read_full_page() against that page will discover all the uptodate * buffers, will set the page uptodate and will perform no I/O. */ /** * mark_buffer_dirty - mark a buffer_head as needing writeout |
67be2dd1b [PATCH] DocBook: ... |
1124 |
* @bh: the buffer_head to mark dirty |
1da177e4c Linux-2.6.12-rc2 |
1125 1126 1127 1128 1129 1130 1131 |
* * mark_buffer_dirty() will set the dirty bit against the buffer, then set its * backing page dirty, then tag the page as dirty in its address_space's radix * tree and then attach the address_space's inode to its superblock's dirty * inode list. * * mark_buffer_dirty() is atomic. It takes bh->b_page->mapping->private_lock, |
250df6ed2 fs: protect inode... |
1132 |
* mapping->tree_lock and mapping->host->i_lock. |
1da177e4c Linux-2.6.12-rc2 |
1133 |
*/ |
fc9b52cd8 fs: remove fastca... |
1134 |
void mark_buffer_dirty(struct buffer_head *bh) |
1da177e4c Linux-2.6.12-rc2 |
1135 |
{ |
787d2214c fs: introduce som... |
1136 |
WARN_ON_ONCE(!buffer_uptodate(bh)); |
1be62dc19 Be more careful a... |
1137 |
|
5305cb830 block: add block_... |
1138 |
trace_block_dirty_buffer(bh); |
1be62dc19 Be more careful a... |
1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 |
/* * Very *carefully* optimize the it-is-already-dirty case. * * Don't let the final "is it dirty" escape to before we * perhaps modified the buffer. */ if (buffer_dirty(bh)) { smp_mb(); if (buffer_dirty(bh)) return; } |
a8e7d49aa Fix race in creat... |
1150 1151 |
if (!test_set_buffer_dirty(bh)) { struct page *page = bh->b_page; |
c4843a759 memcg: add per cg... |
1152 |
struct address_space *mapping = NULL; |
c4843a759 memcg: add per cg... |
1153 |
|
62cccb8c8 mm: simplify lock... |
1154 |
lock_page_memcg(page); |
8e9d78ede Re-introduce page... |
1155 |
if (!TestSetPageDirty(page)) { |
c4843a759 memcg: add per cg... |
1156 |
mapping = page_mapping(page); |
8e9d78ede Re-introduce page... |
1157 |
if (mapping) |
62cccb8c8 mm: simplify lock... |
1158 |
__set_page_dirty(page, mapping, 0); |
8e9d78ede Re-introduce page... |
1159 |
} |
62cccb8c8 mm: simplify lock... |
1160 |
unlock_page_memcg(page); |
c4843a759 memcg: add per cg... |
1161 1162 |
if (mapping) __mark_inode_dirty(mapping->host, I_DIRTY_PAGES); |
a8e7d49aa Fix race in creat... |
1163 |
} |
1da177e4c Linux-2.6.12-rc2 |
1164 |
} |
1fe72eaa0 fs/buffer.c: clea... |
1165 |
EXPORT_SYMBOL(mark_buffer_dirty); |
1da177e4c Linux-2.6.12-rc2 |
1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 |
/* * Decrement a buffer_head's reference count. If all buffers against a page * have zero reference count, are clean and unlocked, and if the page is clean * and unlocked then try_to_free_buffers() may strip the buffers from the page * in preparation for freeing it (sometimes, rarely, buffers are removed from * a page but it ends up not being freed, and buffers may later be reattached). */ void __brelse(struct buffer_head * buf) { if (atomic_read(&buf->b_count)) { put_bh(buf); return; } |
5c752ad9f Use WARN() in fs/ |
1180 1181 |
WARN(1, KERN_ERR "VFS: brelse: Trying to free free buffer "); |
1da177e4c Linux-2.6.12-rc2 |
1182 |
} |
1fe72eaa0 fs/buffer.c: clea... |
1183 |
EXPORT_SYMBOL(__brelse); |
1da177e4c Linux-2.6.12-rc2 |
1184 1185 1186 1187 1188 1189 1190 1191 |
/* * bforget() is like brelse(), except it discards any * potentially dirty data. */ void __bforget(struct buffer_head *bh) { clear_buffer_dirty(bh); |
535ee2fbf buffer_head: fix ... |
1192 |
if (bh->b_assoc_map) { |
1da177e4c Linux-2.6.12-rc2 |
1193 1194 1195 1196 |
struct address_space *buffer_mapping = bh->b_page->mapping; spin_lock(&buffer_mapping->private_lock); list_del_init(&bh->b_assoc_buffers); |
58ff407be [PATCH] Fix IO er... |
1197 |
bh->b_assoc_map = NULL; |
1da177e4c Linux-2.6.12-rc2 |
1198 1199 1200 1201 |
spin_unlock(&buffer_mapping->private_lock); } __brelse(bh); } |
1fe72eaa0 fs/buffer.c: clea... |
1202 |
EXPORT_SYMBOL(__bforget); |
1da177e4c Linux-2.6.12-rc2 |
1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 |
static struct buffer_head *__bread_slow(struct buffer_head *bh) { lock_buffer(bh); if (buffer_uptodate(bh)) { unlock_buffer(bh); return bh; } else { get_bh(bh); bh->b_end_io = end_buffer_read_sync; |
2a222ca99 fs: have submit_b... |
1213 |
submit_bh(REQ_OP_READ, 0, bh); |
1da177e4c Linux-2.6.12-rc2 |
1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 |
wait_on_buffer(bh); if (buffer_uptodate(bh)) return bh; } brelse(bh); return NULL; } /* * Per-cpu buffer LRU implementation. To reduce the cost of __find_get_block(). * The bhs[] array is sorted - newest buffer is at bhs[0]. Buffers have their * refcount elevated by one when they're in an LRU. A buffer can only appear * once in a particular CPU's LRU. A single buffer can be present in multiple * CPU's LRUs at the same time. * * This is a transparent caching front-end to sb_bread(), sb_getblk() and * sb_find_get_block(). * * The LRUs themselves only need locking against invalidate_bh_lrus. We use * a local interrupt disable for that. */ |
86cf78d73 fs/buffer.c: incr... |
1235 |
#define BH_LRU_SIZE 16 |
1da177e4c Linux-2.6.12-rc2 |
1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 |
struct bh_lru { struct buffer_head *bhs[BH_LRU_SIZE]; }; static DEFINE_PER_CPU(struct bh_lru, bh_lrus) = {{ NULL }}; #ifdef CONFIG_SMP #define bh_lru_lock() local_irq_disable() #define bh_lru_unlock() local_irq_enable() #else #define bh_lru_lock() preempt_disable() #define bh_lru_unlock() preempt_enable() #endif static inline void check_irqs_on(void) { #ifdef irqs_disabled BUG_ON(irqs_disabled()); #endif } /* * The LRU management algorithm is dopey-but-simple. Sorry. */ static void bh_lru_install(struct buffer_head *bh) { struct buffer_head *evictee = NULL; |
1da177e4c Linux-2.6.12-rc2 |
1264 1265 1266 |
check_irqs_on(); bh_lru_lock(); |
c7b92516a fs: Use this_cpu_... |
1267 |
if (__this_cpu_read(bh_lrus.bhs[0]) != bh) { |
1da177e4c Linux-2.6.12-rc2 |
1268 1269 1270 1271 1272 1273 1274 |
struct buffer_head *bhs[BH_LRU_SIZE]; int in; int out = 0; get_bh(bh); bhs[out++] = bh; for (in = 0; in < BH_LRU_SIZE; in++) { |
c7b92516a fs: Use this_cpu_... |
1275 1276 |
struct buffer_head *bh2 = __this_cpu_read(bh_lrus.bhs[in]); |
1da177e4c Linux-2.6.12-rc2 |
1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 |
if (bh2 == bh) { __brelse(bh2); } else { if (out >= BH_LRU_SIZE) { BUG_ON(evictee != NULL); evictee = bh2; } else { bhs[out++] = bh2; } } } while (out < BH_LRU_SIZE) bhs[out++] = NULL; |
ca6673b02 block: Replace __... |
1291 |
memcpy(this_cpu_ptr(&bh_lrus.bhs), bhs, sizeof(bhs)); |
1da177e4c Linux-2.6.12-rc2 |
1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 |
} bh_lru_unlock(); if (evictee) __brelse(evictee); } /* * Look up the bh in this cpu's LRU. If it's there, move it to the head. */ |
858119e15 [PATCH] Unlinline... |
1302 |
static struct buffer_head * |
3991d3bd1 [PATCH] warning f... |
1303 |
lookup_bh_lru(struct block_device *bdev, sector_t block, unsigned size) |
1da177e4c Linux-2.6.12-rc2 |
1304 1305 |
{ struct buffer_head *ret = NULL; |
3991d3bd1 [PATCH] warning f... |
1306 |
unsigned int i; |
1da177e4c Linux-2.6.12-rc2 |
1307 1308 1309 |
check_irqs_on(); bh_lru_lock(); |
1da177e4c Linux-2.6.12-rc2 |
1310 |
for (i = 0; i < BH_LRU_SIZE; i++) { |
c7b92516a fs: Use this_cpu_... |
1311 |
struct buffer_head *bh = __this_cpu_read(bh_lrus.bhs[i]); |
1da177e4c Linux-2.6.12-rc2 |
1312 |
|
9470dd5d3 fs: check bh bloc... |
1313 1314 |
if (bh && bh->b_blocknr == block && bh->b_bdev == bdev && bh->b_size == size) { |
1da177e4c Linux-2.6.12-rc2 |
1315 1316 |
if (i) { while (i) { |
c7b92516a fs: Use this_cpu_... |
1317 1318 |
__this_cpu_write(bh_lrus.bhs[i], __this_cpu_read(bh_lrus.bhs[i - 1])); |
1da177e4c Linux-2.6.12-rc2 |
1319 1320 |
i--; } |
c7b92516a fs: Use this_cpu_... |
1321 |
__this_cpu_write(bh_lrus.bhs[0], bh); |
1da177e4c Linux-2.6.12-rc2 |
1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 |
} get_bh(bh); ret = bh; break; } } bh_lru_unlock(); return ret; } /* * Perform a pagecache lookup for the matching buffer. If it's there, refresh * it in the LRU and mark it as accessed. If it is not present then return * NULL */ struct buffer_head * |
3991d3bd1 [PATCH] warning f... |
1338 |
__find_get_block(struct block_device *bdev, sector_t block, unsigned size) |
1da177e4c Linux-2.6.12-rc2 |
1339 1340 1341 1342 |
{ struct buffer_head *bh = lookup_bh_lru(bdev, block, size); if (bh == NULL) { |
2457aec63 mm: non-atomicall... |
1343 |
/* __find_get_block_slow will mark the page accessed */ |
385fd4c59 [PATCH] __find_ge... |
1344 |
bh = __find_get_block_slow(bdev, block); |
1da177e4c Linux-2.6.12-rc2 |
1345 1346 |
if (bh) bh_lru_install(bh); |
2457aec63 mm: non-atomicall... |
1347 |
} else |
1da177e4c Linux-2.6.12-rc2 |
1348 |
touch_buffer(bh); |
2457aec63 mm: non-atomicall... |
1349 |
|
1da177e4c Linux-2.6.12-rc2 |
1350 1351 1352 1353 1354 |
return bh; } EXPORT_SYMBOL(__find_get_block); /* |
3b5e6454a fs/buffer.c: supp... |
1355 |
* __getblk_gfp() will locate (and, if necessary, create) the buffer_head |
1da177e4c Linux-2.6.12-rc2 |
1356 1357 1358 |
* which corresponds to the passed block_device, block and size. The * returned buffer has its reference count incremented. * |
3b5e6454a fs/buffer.c: supp... |
1359 1360 |
* __getblk_gfp() will lock up the machine if grow_dev_page's * try_to_free_buffers() attempt is failing. FIXME, perhaps? |
1da177e4c Linux-2.6.12-rc2 |
1361 1362 |
*/ struct buffer_head * |
3b5e6454a fs/buffer.c: supp... |
1363 1364 |
__getblk_gfp(struct block_device *bdev, sector_t block, unsigned size, gfp_t gfp) |
1da177e4c Linux-2.6.12-rc2 |
1365 1366 1367 1368 1369 |
{ struct buffer_head *bh = __find_get_block(bdev, block, size); might_sleep(); if (bh == NULL) |
3b5e6454a fs/buffer.c: supp... |
1370 |
bh = __getblk_slow(bdev, block, size, gfp); |
1da177e4c Linux-2.6.12-rc2 |
1371 1372 |
return bh; } |
3b5e6454a fs/buffer.c: supp... |
1373 |
EXPORT_SYMBOL(__getblk_gfp); |
1da177e4c Linux-2.6.12-rc2 |
1374 1375 1376 1377 |
/* * Do async read-ahead on a buffer.. */ |
3991d3bd1 [PATCH] warning f... |
1378 |
void __breadahead(struct block_device *bdev, sector_t block, unsigned size) |
1da177e4c Linux-2.6.12-rc2 |
1379 1380 |
{ struct buffer_head *bh = __getblk(bdev, block, size); |
a3e713b5f [PATCH] __bread o... |
1381 |
if (likely(bh)) { |
70246286e block: get rid of... |
1382 |
ll_rw_block(REQ_OP_READ, REQ_RAHEAD, 1, &bh); |
a3e713b5f [PATCH] __bread o... |
1383 1384 |
brelse(bh); } |
1da177e4c Linux-2.6.12-rc2 |
1385 1386 1387 1388 |
} EXPORT_SYMBOL(__breadahead); /** |
3b5e6454a fs/buffer.c: supp... |
1389 |
* __bread_gfp() - reads a specified block and returns the bh |
67be2dd1b [PATCH] DocBook: ... |
1390 |
* @bdev: the block_device to read from |
1da177e4c Linux-2.6.12-rc2 |
1391 1392 |
* @block: number of block * @size: size (in bytes) to read |
3b5e6454a fs/buffer.c: supp... |
1393 1394 |
* @gfp: page allocation flag * |
1da177e4c Linux-2.6.12-rc2 |
1395 |
* Reads a specified block, and returns buffer head that contains it. |
3b5e6454a fs/buffer.c: supp... |
1396 1397 |
* The page cache can be allocated from non-movable area * not to prevent page migration if you set gfp to zero. |
1da177e4c Linux-2.6.12-rc2 |
1398 1399 1400 |
* It returns NULL if the block was unreadable. */ struct buffer_head * |
3b5e6454a fs/buffer.c: supp... |
1401 1402 |
__bread_gfp(struct block_device *bdev, sector_t block, unsigned size, gfp_t gfp) |
1da177e4c Linux-2.6.12-rc2 |
1403 |
{ |
3b5e6454a fs/buffer.c: supp... |
1404 |
struct buffer_head *bh = __getblk_gfp(bdev, block, size, gfp); |
1da177e4c Linux-2.6.12-rc2 |
1405 |
|
a3e713b5f [PATCH] __bread o... |
1406 |
if (likely(bh) && !buffer_uptodate(bh)) |
1da177e4c Linux-2.6.12-rc2 |
1407 1408 1409 |
bh = __bread_slow(bh); return bh; } |
3b5e6454a fs/buffer.c: supp... |
1410 |
EXPORT_SYMBOL(__bread_gfp); |
1da177e4c Linux-2.6.12-rc2 |
1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 |
/* * invalidate_bh_lrus() is called rarely - but not only at unmount. * This doesn't race because it runs in each cpu either in irq * or with preempt disabled. */ static void invalidate_bh_lru(void *arg) { struct bh_lru *b = &get_cpu_var(bh_lrus); int i; for (i = 0; i < BH_LRU_SIZE; i++) { brelse(b->bhs[i]); b->bhs[i] = NULL; } put_cpu_var(bh_lrus); } |
42be35d03 fs: only send IPI... |
1428 1429 1430 1431 1432 |
static bool has_bh_in_lru(int cpu, void *dummy) { struct bh_lru *b = per_cpu_ptr(&bh_lrus, cpu); int i; |
1da177e4c Linux-2.6.12-rc2 |
1433 |
|
42be35d03 fs: only send IPI... |
1434 1435 1436 1437 1438 1439 1440 |
for (i = 0; i < BH_LRU_SIZE; i++) { if (b->bhs[i]) return 1; } return 0; } |
f9a14399a mm: optimize kill... |
1441 |
void invalidate_bh_lrus(void) |
1da177e4c Linux-2.6.12-rc2 |
1442 |
{ |
42be35d03 fs: only send IPI... |
1443 |
on_each_cpu_cond(has_bh_in_lru, invalidate_bh_lru, NULL, 1, GFP_KERNEL); |
1da177e4c Linux-2.6.12-rc2 |
1444 |
} |
9db5579be rewrite rd |
1445 |
EXPORT_SYMBOL_GPL(invalidate_bh_lrus); |
1da177e4c Linux-2.6.12-rc2 |
1446 1447 1448 1449 1450 |
void set_bh_page(struct buffer_head *bh, struct page *page, unsigned long offset) { bh->b_page = page; |
e827f9235 BUG_ON() Conversi... |
1451 |
BUG_ON(offset >= PAGE_SIZE); |
1da177e4c Linux-2.6.12-rc2 |
1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 |
if (PageHighMem(page)) /* * This catches illegal uses and preserves the offset: */ bh->b_data = (char *)(0 + offset); else bh->b_data = page_address(page) + offset; } EXPORT_SYMBOL(set_bh_page); /* * Called when truncating a buffer on a page completely. */ |
e7470ee89 fs: buffer: do no... |
1465 1466 1467 1468 1469 |
/* Bits that are cleared during an invalidate */ #define BUFFER_FLAGS_DISCARD \ (1 << BH_Mapped | 1 << BH_New | 1 << BH_Req | \ 1 << BH_Delay | 1 << BH_Unwritten) |
858119e15 [PATCH] Unlinline... |
1470 |
static void discard_buffer(struct buffer_head * bh) |
1da177e4c Linux-2.6.12-rc2 |
1471 |
{ |
e7470ee89 fs: buffer: do no... |
1472 |
unsigned long b_state, b_state_old; |
1da177e4c Linux-2.6.12-rc2 |
1473 1474 1475 |
lock_buffer(bh); clear_buffer_dirty(bh); bh->b_bdev = NULL; |
e7470ee89 fs: buffer: do no... |
1476 1477 1478 1479 1480 1481 1482 1483 |
b_state = bh->b_state; for (;;) { b_state_old = cmpxchg(&bh->b_state, b_state, (b_state & ~BUFFER_FLAGS_DISCARD)); if (b_state_old == b_state) break; b_state = b_state_old; } |
1da177e4c Linux-2.6.12-rc2 |
1484 1485 1486 1487 |
unlock_buffer(bh); } /** |
814e1d25a cleanup: vfs: sma... |
1488 |
* block_invalidatepage - invalidate part or all of a buffer-backed page |
1da177e4c Linux-2.6.12-rc2 |
1489 1490 |
* * @page: the page which is affected |
d47992f86 mm: change invali... |
1491 1492 |
* @offset: start of the range to invalidate * @length: length of the range to invalidate |
1da177e4c Linux-2.6.12-rc2 |
1493 1494 |
* * block_invalidatepage() is called when all or part of the page has become |
814e1d25a cleanup: vfs: sma... |
1495 |
* invalidated by a truncate operation. |
1da177e4c Linux-2.6.12-rc2 |
1496 1497 1498 1499 1500 1501 1502 |
* * block_invalidatepage() does not have to release all buffers, but it must * ensure that no dirty buffer is left outside @offset and that no I/O * is underway against any of the blocks which are outside the truncation * point. Because the caller is about to free (and possibly reuse) those * blocks on-disk. */ |
d47992f86 mm: change invali... |
1503 1504 |
void block_invalidatepage(struct page *page, unsigned int offset, unsigned int length) |
1da177e4c Linux-2.6.12-rc2 |
1505 1506 1507 |
{ struct buffer_head *head, *bh, *next; unsigned int curr_off = 0; |
d47992f86 mm: change invali... |
1508 |
unsigned int stop = length + offset; |
1da177e4c Linux-2.6.12-rc2 |
1509 1510 1511 1512 |
BUG_ON(!PageLocked(page)); if (!page_has_buffers(page)) goto out; |
d47992f86 mm: change invali... |
1513 1514 1515 |
/* * Check for overflow */ |
09cbfeaf1 mm, fs: get rid o... |
1516 |
BUG_ON(stop > PAGE_SIZE || stop < length); |
d47992f86 mm: change invali... |
1517 |
|
1da177e4c Linux-2.6.12-rc2 |
1518 1519 1520 1521 1522 1523 1524 |
head = page_buffers(page); bh = head; do { unsigned int next_off = curr_off + bh->b_size; next = bh->b_this_page; /* |
d47992f86 mm: change invali... |
1525 1526 1527 1528 1529 1530 |
* Are we still fully in range ? */ if (next_off > stop) goto out; /* |
1da177e4c Linux-2.6.12-rc2 |
1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 |
* is this block fully invalidated? */ if (offset <= curr_off) discard_buffer(bh); curr_off = next_off; bh = next; } while (bh != head); /* * We release buffers only if the entire page is being invalidated. * The get_block cached value has been unconditionally invalidated, * so real IO is not possible anymore. */ if (offset == 0) |
2ff28e22b [PATCH] Make addr... |
1545 |
try_to_release_page(page, 0); |
1da177e4c Linux-2.6.12-rc2 |
1546 |
out: |
2ff28e22b [PATCH] Make addr... |
1547 |
return; |
1da177e4c Linux-2.6.12-rc2 |
1548 1549 |
} EXPORT_SYMBOL(block_invalidatepage); |
d47992f86 mm: change invali... |
1550 |
|
1da177e4c Linux-2.6.12-rc2 |
1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 |
/* * We attach and possibly dirty the buffers atomically wrt * __set_page_dirty_buffers() via private_lock. try_to_free_buffers * is already excluded via the page lock. */ void create_empty_buffers(struct page *page, unsigned long blocksize, unsigned long b_state) { struct buffer_head *bh, *head, *tail; head = alloc_page_buffers(page, blocksize, 1); bh = head; do { bh->b_state |= b_state; tail = bh; bh = bh->b_this_page; } while (bh); tail->b_this_page = head; spin_lock(&page->mapping->private_lock); if (PageUptodate(page) || PageDirty(page)) { bh = head; do { if (PageDirty(page)) set_buffer_dirty(bh); if (PageUptodate(page)) set_buffer_uptodate(bh); bh = bh->b_this_page; } while (bh != head); } attach_page_buffers(page, head); spin_unlock(&page->mapping->private_lock); } EXPORT_SYMBOL(create_empty_buffers); /* * We are taking a block for data and we don't want any output from any * buffer-cache aliases starting from return from that function and * until the moment when something will explicitly mark the buffer * dirty (hopefully that will not happen until we will free that block ;-) * We don't even need to mark it not-uptodate - nobody can expect * anything from a newly allocated buffer anyway. We used to used * unmap_buffer() for such invalidation, but that was wrong. We definitely * don't want to mark the alias unmapped, for example - it would confuse * anyone who might pick it with bread() afterwards... * * Also.. Note that bforget() doesn't lock the buffer. So there can * be writeout I/O going on against recently-freed buffers. We don't * wait on that I/O in bforget() - it's more efficient to wait on the I/O * only if we really need to. That happens here. */ void unmap_underlying_metadata(struct block_device *bdev, sector_t block) { struct buffer_head *old_bh; might_sleep(); |
385fd4c59 [PATCH] __find_ge... |
1607 |
old_bh = __find_get_block_slow(bdev, block); |
1da177e4c Linux-2.6.12-rc2 |
1608 1609 1610 1611 1612 1613 1614 1615 1616 1617 |
if (old_bh) { clear_buffer_dirty(old_bh); wait_on_buffer(old_bh); clear_buffer_req(old_bh); __brelse(old_bh); } } EXPORT_SYMBOL(unmap_underlying_metadata); /* |
45bce8f3e fs/buffer.c: make... |
1618 1619 1620 1621 1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639 |
* Size is a power-of-two in the range 512..PAGE_SIZE, * and the case we care about most is PAGE_SIZE. * * So this *could* possibly be written with those * constraints in mind (relevant mostly if some * architecture has a slow bit-scan instruction) */ static inline int block_size_bits(unsigned int blocksize) { return ilog2(blocksize); } static struct buffer_head *create_page_buffers(struct page *page, struct inode *inode, unsigned int b_state) { BUG_ON(!PageLocked(page)); if (!page_has_buffers(page)) create_empty_buffers(page, 1 << ACCESS_ONCE(inode->i_blkbits), b_state); return page_buffers(page); } /* |
1da177e4c Linux-2.6.12-rc2 |
1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 |
* NOTE! All mapped/uptodate combinations are valid: * * Mapped Uptodate Meaning * * No No "unknown" - must do get_block() * No Yes "hole" - zero-filled * Yes No "allocated" - allocated on disk, not read in * Yes Yes "valid" - allocated and up-to-date in memory. * * "Dirty" is valid only with the last case (mapped+uptodate). */ /* * While block_write_full_page is writing back the dirty buffers under * the page lock, whoever dirtied the buffers may decide to clean them * again at any time. We handle that by only looking at the buffer * state inside lock_buffer(). * * If block_write_full_page() is called for regular writeback * (wbc->sync_mode == WB_SYNC_NONE) then it will redirty a page which has a * locked buffer. This only can happen if someone has written the buffer * directly, with submit_bh(). At the address_space level PageWriteback * prevents this contention from occurring. |
6e34eeddf block_write_full_... |
1663 1664 |
* * If block_write_full_page() is called with wbc->sync_mode == |
721a9602e block: kill off R... |
1665 1666 |
* WB_SYNC_ALL, the writes are posted using WRITE_SYNC; this * causes the writes to be flagged as synchronous writes. |
1da177e4c Linux-2.6.12-rc2 |
1667 |
*/ |
b4bba3890 fs: export __bloc... |
1668 |
int __block_write_full_page(struct inode *inode, struct page *page, |
35c80d5f4 Add block_write_f... |
1669 1670 |
get_block_t *get_block, struct writeback_control *wbc, bh_end_io_t *handler) |
1da177e4c Linux-2.6.12-rc2 |
1671 1672 1673 1674 |
{ int err; sector_t block; sector_t last_block; |
f0fbd5fc0 [PATCH] __block_w... |
1675 |
struct buffer_head *bh, *head; |
45bce8f3e fs/buffer.c: make... |
1676 |
unsigned int blocksize, bbits; |
1da177e4c Linux-2.6.12-rc2 |
1677 |
int nr_underway = 0; |
2a222ca99 fs: have submit_b... |
1678 |
int write_flags = (wbc->sync_mode == WB_SYNC_ALL ? WRITE_SYNC : 0); |
1da177e4c Linux-2.6.12-rc2 |
1679 |
|
45bce8f3e fs/buffer.c: make... |
1680 |
head = create_page_buffers(page, inode, |
1da177e4c Linux-2.6.12-rc2 |
1681 |
(1 << BH_Dirty)|(1 << BH_Uptodate)); |
1da177e4c Linux-2.6.12-rc2 |
1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 |
/* * Be very careful. We have no exclusion from __set_page_dirty_buffers * here, and the (potentially unmapped) buffers may become dirty at * any time. If a buffer becomes dirty here after we've inspected it * then we just miss that fact, and the page stays dirty. * * Buffers outside i_size may be dirtied by __set_page_dirty_buffers; * handle that here by just cleaning them. */ |
1da177e4c Linux-2.6.12-rc2 |
1692 |
bh = head; |
45bce8f3e fs/buffer.c: make... |
1693 1694 |
blocksize = bh->b_size; bbits = block_size_bits(blocksize); |
09cbfeaf1 mm, fs: get rid o... |
1695 |
block = (sector_t)page->index << (PAGE_SHIFT - bbits); |
45bce8f3e fs/buffer.c: make... |
1696 |
last_block = (i_size_read(inode) - 1) >> bbits; |
1da177e4c Linux-2.6.12-rc2 |
1697 1698 1699 1700 1701 1702 1703 1704 1705 1706 1707 1708 1709 1710 1711 1712 1713 |
/* * Get all the dirty buffers mapped to disk addresses and * handle any aliases from the underlying blockdev's mapping. */ do { if (block > last_block) { /* * mapped buffers outside i_size will occur, because * this page can be outside i_size when there is a * truncate in progress. */ /* * The buffer was zeroed by block_write_full_page() */ clear_buffer_dirty(bh); set_buffer_uptodate(bh); |
29a814d2e vfs: add hooks fo... |
1714 1715 |
} else if ((!buffer_mapped(bh) || buffer_delay(bh)) && buffer_dirty(bh)) { |
b0cf2321c [PATCH] pass b_si... |
1716 |
WARN_ON(bh->b_size != blocksize); |
1da177e4c Linux-2.6.12-rc2 |
1717 1718 1719 |
err = get_block(inode, block, bh, 1); if (err) goto recover; |
29a814d2e vfs: add hooks fo... |
1720 |
clear_buffer_delay(bh); |
1da177e4c Linux-2.6.12-rc2 |
1721 1722 1723 1724 1725 1726 1727 1728 1729 1730 1731 1732 |
if (buffer_new(bh)) { /* blockdev mappings never come here */ clear_buffer_new(bh); unmap_underlying_metadata(bh->b_bdev, bh->b_blocknr); } } bh = bh->b_this_page; block++; } while (bh != head); do { |
1da177e4c Linux-2.6.12-rc2 |
1733 1734 1735 1736 1737 |
if (!buffer_mapped(bh)) continue; /* * If it's a fully non-blocking write attempt and we cannot * lock the buffer then redirty the page. Note that this can |
5b0830cb9 writeback: get ri... |
1738 1739 1740 |
* potentially cause a busy-wait loop from writeback threads * and kswapd activity, but those code paths have their own * higher-level throttling. |
1da177e4c Linux-2.6.12-rc2 |
1741 |
*/ |
1b430beee writeback: remove... |
1742 |
if (wbc->sync_mode != WB_SYNC_NONE) { |
1da177e4c Linux-2.6.12-rc2 |
1743 |
lock_buffer(bh); |
ca5de404f fs: rename buffer... |
1744 |
} else if (!trylock_buffer(bh)) { |
1da177e4c Linux-2.6.12-rc2 |
1745 1746 1747 1748 |
redirty_page_for_writepage(wbc, page); continue; } if (test_clear_buffer_dirty(bh)) { |
35c80d5f4 Add block_write_f... |
1749 |
mark_buffer_async_write_endio(bh, handler); |
1da177e4c Linux-2.6.12-rc2 |
1750 1751 1752 1753 1754 1755 1756 1757 1758 1759 1760 |
} else { unlock_buffer(bh); } } while ((bh = bh->b_this_page) != head); /* * The page and its buffers are protected by PageWriteback(), so we can * drop the bh refcounts early. */ BUG_ON(PageWriteback(page)); set_page_writeback(page); |
1da177e4c Linux-2.6.12-rc2 |
1761 1762 1763 1764 |
do { struct buffer_head *next = bh->b_this_page; if (buffer_async_write(bh)) { |
2a222ca99 fs: have submit_b... |
1765 |
submit_bh_wbc(REQ_OP_WRITE, write_flags, bh, 0, wbc); |
1da177e4c Linux-2.6.12-rc2 |
1766 1767 |
nr_underway++; } |
1da177e4c Linux-2.6.12-rc2 |
1768 1769 |
bh = next; } while (bh != head); |
05937baae [PATCH] __block_w... |
1770 |
unlock_page(page); |
1da177e4c Linux-2.6.12-rc2 |
1771 1772 1773 1774 1775 1776 1777 1778 1779 |
err = 0; done: if (nr_underway == 0) { /* * The page was marked dirty, but the buffers were * clean. Someone wrote them back by hand with * ll_rw_block/submit_bh. A rare case. */ |
1da177e4c Linux-2.6.12-rc2 |
1780 |
end_page_writeback(page); |
3d67f2d7c fs: buffer don't ... |
1781 |
|
1da177e4c Linux-2.6.12-rc2 |
1782 1783 1784 1785 |
/* * The page and buffer_heads can be released at any time from * here on. */ |
1da177e4c Linux-2.6.12-rc2 |
1786 1787 1788 1789 1790 1791 1792 1793 1794 1795 1796 1797 1798 |
} return err; recover: /* * ENOSPC, or some other error. We may already have added some * blocks to the file, so we need to write these out to avoid * exposing stale data. * The page is currently locked and not marked for writeback */ bh = head; /* Recovery: lock and submit the mapped buffers */ do { |
29a814d2e vfs: add hooks fo... |
1799 1800 |
if (buffer_mapped(bh) && buffer_dirty(bh) && !buffer_delay(bh)) { |
1da177e4c Linux-2.6.12-rc2 |
1801 |
lock_buffer(bh); |
35c80d5f4 Add block_write_f... |
1802 |
mark_buffer_async_write_endio(bh, handler); |
1da177e4c Linux-2.6.12-rc2 |
1803 1804 1805 1806 1807 1808 1809 1810 1811 1812 |
} else { /* * The buffer may have been set dirty during * attachment to a dirty page. */ clear_buffer_dirty(bh); } } while ((bh = bh->b_this_page) != head); SetPageError(page); BUG_ON(PageWriteback(page)); |
7e4c3690b block_write_full_... |
1813 |
mapping_set_error(page->mapping, err); |
1da177e4c Linux-2.6.12-rc2 |
1814 |
set_page_writeback(page); |
1da177e4c Linux-2.6.12-rc2 |
1815 1816 1817 1818 |
do { struct buffer_head *next = bh->b_this_page; if (buffer_async_write(bh)) { clear_buffer_dirty(bh); |
2a222ca99 fs: have submit_b... |
1819 |
submit_bh_wbc(REQ_OP_WRITE, write_flags, bh, 0, wbc); |
1da177e4c Linux-2.6.12-rc2 |
1820 1821 |
nr_underway++; } |
1da177e4c Linux-2.6.12-rc2 |
1822 1823 |
bh = next; } while (bh != head); |
ffda9d302 [PATCH] fs: fix _... |
1824 |
unlock_page(page); |
1da177e4c Linux-2.6.12-rc2 |
1825 1826 |
goto done; } |
b4bba3890 fs: export __bloc... |
1827 |
EXPORT_SYMBOL(__block_write_full_page); |
1da177e4c Linux-2.6.12-rc2 |
1828 |
|
afddba49d fs: introduce wri... |
1829 1830 1831 1832 1833 1834 1835 1836 1837 1838 1839 1840 1841 1842 1843 1844 1845 1846 1847 1848 1849 1850 1851 1852 1853 1854 |
/* * If a page has any new buffers, zero them out here, and mark them uptodate * and dirty so they'll be written out (in order to prevent uninitialised * block data from leaking). And clear the new bit. */ void page_zero_new_buffers(struct page *page, unsigned from, unsigned to) { unsigned int block_start, block_end; struct buffer_head *head, *bh; BUG_ON(!PageLocked(page)); if (!page_has_buffers(page)) return; bh = head = page_buffers(page); block_start = 0; do { block_end = block_start + bh->b_size; if (buffer_new(bh)) { if (block_end > from && block_start < to) { if (!PageUptodate(page)) { unsigned start, size; start = max(from, block_start); size = min(to, block_end) - start; |
eebd2aa35 Pagecache zeroing... |
1855 |
zero_user(page, start, size); |
afddba49d fs: introduce wri... |
1856 1857 1858 1859 1860 1861 1862 1863 1864 1865 1866 1867 1868 |
set_buffer_uptodate(bh); } clear_buffer_new(bh); mark_buffer_dirty(bh); } } block_start = block_end; bh = bh->b_this_page; } while (bh != head); } EXPORT_SYMBOL(page_zero_new_buffers); |
ae259a9c8 fs: introduce iom... |
1869 1870 1871 1872 1873 1874 1875 1876 1877 1878 1879 1880 1881 1882 1883 1884 1885 1886 1887 1888 1889 1890 1891 1892 1893 1894 1895 1896 1897 1898 1899 1900 1901 1902 1903 1904 1905 1906 1907 1908 1909 1910 1911 1912 1913 1914 1915 1916 1917 1918 1919 1920 1921 1922 1923 1924 |
static void iomap_to_bh(struct inode *inode, sector_t block, struct buffer_head *bh, struct iomap *iomap) { loff_t offset = block << inode->i_blkbits; bh->b_bdev = iomap->bdev; /* * Block points to offset in file we need to map, iomap contains * the offset at which the map starts. If the map ends before the * current block, then do not map the buffer and let the caller * handle it. */ BUG_ON(offset >= iomap->offset + iomap->length); switch (iomap->type) { case IOMAP_HOLE: /* * If the buffer is not up to date or beyond the current EOF, * we need to mark it as new to ensure sub-block zeroing is * executed if necessary. */ if (!buffer_uptodate(bh) || (offset >= i_size_read(inode))) set_buffer_new(bh); break; case IOMAP_DELALLOC: if (!buffer_uptodate(bh) || (offset >= i_size_read(inode))) set_buffer_new(bh); set_buffer_uptodate(bh); set_buffer_mapped(bh); set_buffer_delay(bh); break; case IOMAP_UNWRITTEN: /* * For unwritten regions, we always need to ensure that * sub-block writes cause the regions in the block we are not * writing to are zeroed. Set the buffer as new to ensure this. */ set_buffer_new(bh); set_buffer_unwritten(bh); /* FALLTHRU */ case IOMAP_MAPPED: if (offset >= i_size_read(inode)) set_buffer_new(bh); bh->b_blocknr = (iomap->blkno >> (inode->i_blkbits - 9)) + ((offset - iomap->offset) >> inode->i_blkbits); set_buffer_mapped(bh); break; } } int __block_write_begin_int(struct page *page, loff_t pos, unsigned len, get_block_t *get_block, struct iomap *iomap) |
1da177e4c Linux-2.6.12-rc2 |
1925 |
{ |
09cbfeaf1 mm, fs: get rid o... |
1926 |
unsigned from = pos & (PAGE_SIZE - 1); |
ebdec241d fs: kill block_pr... |
1927 |
unsigned to = from + len; |
6e1db88d5 introduce __block... |
1928 |
struct inode *inode = page->mapping->host; |
1da177e4c Linux-2.6.12-rc2 |
1929 1930 1931 1932 1933 1934 1935 |
unsigned block_start, block_end; sector_t block; int err = 0; unsigned blocksize, bbits; struct buffer_head *bh, *head, *wait[2], **wait_bh=wait; BUG_ON(!PageLocked(page)); |
09cbfeaf1 mm, fs: get rid o... |
1936 1937 |
BUG_ON(from > PAGE_SIZE); BUG_ON(to > PAGE_SIZE); |
1da177e4c Linux-2.6.12-rc2 |
1938 |
BUG_ON(from > to); |
45bce8f3e fs/buffer.c: make... |
1939 1940 1941 |
head = create_page_buffers(page, inode, 0); blocksize = head->b_size; bbits = block_size_bits(blocksize); |
1da177e4c Linux-2.6.12-rc2 |
1942 |
|
09cbfeaf1 mm, fs: get rid o... |
1943 |
block = (sector_t)page->index << (PAGE_SHIFT - bbits); |
1da177e4c Linux-2.6.12-rc2 |
1944 1945 1946 1947 1948 1949 1950 1951 1952 1953 1954 1955 1956 1957 |
for(bh = head, block_start = 0; bh != head || !block_start; block++, block_start=block_end, bh = bh->b_this_page) { block_end = block_start + blocksize; if (block_end <= from || block_start >= to) { if (PageUptodate(page)) { if (!buffer_uptodate(bh)) set_buffer_uptodate(bh); } continue; } if (buffer_new(bh)) clear_buffer_new(bh); if (!buffer_mapped(bh)) { |
b0cf2321c [PATCH] pass b_si... |
1958 |
WARN_ON(bh->b_size != blocksize); |
ae259a9c8 fs: introduce iom... |
1959 1960 1961 1962 1963 1964 1965 |
if (get_block) { err = get_block(inode, block, bh, 1); if (err) break; } else { iomap_to_bh(inode, block, bh, iomap); } |
1da177e4c Linux-2.6.12-rc2 |
1966 |
if (buffer_new(bh)) { |
1da177e4c Linux-2.6.12-rc2 |
1967 1968 1969 |
unmap_underlying_metadata(bh->b_bdev, bh->b_blocknr); if (PageUptodate(page)) { |
637aff46f fs: fix data-loss... |
1970 |
clear_buffer_new(bh); |
1da177e4c Linux-2.6.12-rc2 |
1971 |
set_buffer_uptodate(bh); |
637aff46f fs: fix data-loss... |
1972 |
mark_buffer_dirty(bh); |
1da177e4c Linux-2.6.12-rc2 |
1973 1974 |
continue; } |
eebd2aa35 Pagecache zeroing... |
1975 1976 1977 1978 |
if (block_end > to || block_start < from) zero_user_segments(page, to, block_end, block_start, from); |
1da177e4c Linux-2.6.12-rc2 |
1979 1980 1981 1982 1983 1984 1985 1986 1987 |
continue; } } if (PageUptodate(page)) { if (!buffer_uptodate(bh)) set_buffer_uptodate(bh); continue; } if (!buffer_uptodate(bh) && !buffer_delay(bh) && |
33a266dda [PATCH] Make BH_U... |
1988 |
!buffer_unwritten(bh) && |
1da177e4c Linux-2.6.12-rc2 |
1989 |
(block_start < from || block_end > to)) { |
dfec8a14f fs: have ll_rw_bl... |
1990 |
ll_rw_block(REQ_OP_READ, 0, 1, &bh); |
1da177e4c Linux-2.6.12-rc2 |
1991 1992 1993 1994 1995 1996 1997 1998 1999 |
*wait_bh++=bh; } } /* * If we issued read requests - let them complete. */ while(wait_bh > wait) { wait_on_buffer(*--wait_bh); if (!buffer_uptodate(*wait_bh)) |
f3ddbdc62 [PATCH] fix race ... |
2000 |
err = -EIO; |
1da177e4c Linux-2.6.12-rc2 |
2001 |
} |
f9f07b6c1 vfs: Fix data cor... |
2002 |
if (unlikely(err)) |
afddba49d fs: introduce wri... |
2003 |
page_zero_new_buffers(page, from, to); |
1da177e4c Linux-2.6.12-rc2 |
2004 2005 |
return err; } |
ae259a9c8 fs: introduce iom... |
2006 2007 2008 2009 2010 2011 |
int __block_write_begin(struct page *page, loff_t pos, unsigned len, get_block_t *get_block) { return __block_write_begin_int(page, pos, len, get_block, NULL); } |
ebdec241d fs: kill block_pr... |
2012 |
EXPORT_SYMBOL(__block_write_begin); |
1da177e4c Linux-2.6.12-rc2 |
2013 2014 2015 2016 2017 2018 2019 2020 |
static int __block_commit_write(struct inode *inode, struct page *page, unsigned from, unsigned to) { unsigned block_start, block_end; int partial = 0; unsigned blocksize; struct buffer_head *bh, *head; |
45bce8f3e fs/buffer.c: make... |
2021 2022 |
bh = head = page_buffers(page); blocksize = bh->b_size; |
1da177e4c Linux-2.6.12-rc2 |
2023 |
|
45bce8f3e fs/buffer.c: make... |
2024 2025 |
block_start = 0; do { |
1da177e4c Linux-2.6.12-rc2 |
2026 2027 2028 2029 2030 2031 2032 2033 |
block_end = block_start + blocksize; if (block_end <= from || block_start >= to) { if (!buffer_uptodate(bh)) partial = 1; } else { set_buffer_uptodate(bh); mark_buffer_dirty(bh); } |
afddba49d fs: introduce wri... |
2034 |
clear_buffer_new(bh); |
45bce8f3e fs/buffer.c: make... |
2035 2036 2037 2038 |
block_start = block_end; bh = bh->b_this_page; } while (bh != head); |
1da177e4c Linux-2.6.12-rc2 |
2039 2040 2041 2042 2043 2044 2045 2046 2047 2048 2049 2050 2051 |
/* * If this is a partial write which happened to make all buffers * uptodate then we can optimize away a bogus readpage() for * the next read(). Here we 'discover' whether the page went * uptodate as a result of this (potentially partial) write. */ if (!partial) SetPageUptodate(page); return 0; } /* |
155130a4f get rid of block_... |
2052 2053 2054 |
* block_write_begin takes care of the basic task of block allocation and * bringing partial write blocks uptodate first. * |
7bb46a673 fs: introduce new... |
2055 |
* The filesystem needs to handle block truncation upon failure. |
afddba49d fs: introduce wri... |
2056 |
*/ |
155130a4f get rid of block_... |
2057 2058 |
int block_write_begin(struct address_space *mapping, loff_t pos, unsigned len, unsigned flags, struct page **pagep, get_block_t *get_block) |
afddba49d fs: introduce wri... |
2059 |
{ |
09cbfeaf1 mm, fs: get rid o... |
2060 |
pgoff_t index = pos >> PAGE_SHIFT; |
afddba49d fs: introduce wri... |
2061 |
struct page *page; |
6e1db88d5 introduce __block... |
2062 |
int status; |
afddba49d fs: introduce wri... |
2063 |
|
6e1db88d5 introduce __block... |
2064 2065 2066 |
page = grab_cache_page_write_begin(mapping, index, flags); if (!page) return -ENOMEM; |
afddba49d fs: introduce wri... |
2067 |
|
6e1db88d5 introduce __block... |
2068 |
status = __block_write_begin(page, pos, len, get_block); |
afddba49d fs: introduce wri... |
2069 |
if (unlikely(status)) { |
6e1db88d5 introduce __block... |
2070 |
unlock_page(page); |
09cbfeaf1 mm, fs: get rid o... |
2071 |
put_page(page); |
6e1db88d5 introduce __block... |
2072 |
page = NULL; |
afddba49d fs: introduce wri... |
2073 |
} |
6e1db88d5 introduce __block... |
2074 |
*pagep = page; |
afddba49d fs: introduce wri... |
2075 2076 2077 2078 2079 2080 2081 2082 2083 2084 |
return status; } EXPORT_SYMBOL(block_write_begin); int block_write_end(struct file *file, struct address_space *mapping, loff_t pos, unsigned len, unsigned copied, struct page *page, void *fsdata) { struct inode *inode = mapping->host; unsigned start; |
09cbfeaf1 mm, fs: get rid o... |
2085 |
start = pos & (PAGE_SIZE - 1); |
afddba49d fs: introduce wri... |
2086 2087 2088 2089 2090 2091 2092 2093 2094 2095 2096 2097 2098 2099 2100 2101 2102 2103 2104 2105 2106 2107 2108 2109 2110 2111 2112 2113 2114 2115 2116 2117 2118 |
if (unlikely(copied < len)) { /* * The buffers that were written will now be uptodate, so we * don't have to worry about a readpage reading them and * overwriting a partial write. However if we have encountered * a short write and only partially written into a buffer, it * will not be marked uptodate, so a readpage might come in and * destroy our partial write. * * Do the simplest thing, and just treat any short write to a * non uptodate page as a zero-length write, and force the * caller to redo the whole thing. */ if (!PageUptodate(page)) copied = 0; page_zero_new_buffers(page, start+copied, start+len); } flush_dcache_page(page); /* This could be a short (even 0-length) commit */ __block_commit_write(inode, page, start, start+copied); return copied; } EXPORT_SYMBOL(block_write_end); int generic_write_end(struct file *file, struct address_space *mapping, loff_t pos, unsigned len, unsigned copied, struct page *page, void *fsdata) { struct inode *inode = mapping->host; |
90a802027 vfs: fix data cor... |
2119 |
loff_t old_size = inode->i_size; |
c7d206b33 vfs: Move mark_in... |
2120 |
int i_size_changed = 0; |
afddba49d fs: introduce wri... |
2121 2122 2123 2124 2125 2126 2127 2128 2129 2130 2131 2132 |
copied = block_write_end(file, mapping, pos, len, copied, page, fsdata); /* * No need to use i_size_read() here, the i_size * cannot change under us because we hold i_mutex. * * But it's important to update i_size while still holding page lock: * page writeout could otherwise come in and zero beyond i_size. */ if (pos+copied > inode->i_size) { i_size_write(inode, pos+copied); |
c7d206b33 vfs: Move mark_in... |
2133 |
i_size_changed = 1; |
afddba49d fs: introduce wri... |
2134 2135 2136 |
} unlock_page(page); |
09cbfeaf1 mm, fs: get rid o... |
2137 |
put_page(page); |
afddba49d fs: introduce wri... |
2138 |
|
90a802027 vfs: fix data cor... |
2139 2140 |
if (old_size < pos) pagecache_isize_extended(inode, old_size, pos); |
c7d206b33 vfs: Move mark_in... |
2141 2142 2143 2144 2145 2146 2147 2148 |
/* * Don't mark the inode dirty under page lock. First, it unnecessarily * makes the holding time of page lock longer. Second, it forces lock * ordering of page lock and transaction start for journaling * filesystems. */ if (i_size_changed) mark_inode_dirty(inode); |
afddba49d fs: introduce wri... |
2149 2150 2151 2152 2153 |
return copied; } EXPORT_SYMBOL(generic_write_end); /* |
8ab22b9ab vfs: pagecache us... |
2154 2155 2156 2157 2158 2159 |
* block_is_partially_uptodate checks whether buffers within a page are * uptodate or not. * * Returns true if all buffers which correspond to a file portion * we want to read are uptodate. */ |
c186afb4d switch ->is_parti... |
2160 2161 |
int block_is_partially_uptodate(struct page *page, unsigned long from, unsigned long count) |
8ab22b9ab vfs: pagecache us... |
2162 |
{ |
8ab22b9ab vfs: pagecache us... |
2163 2164 2165 2166 2167 2168 2169 |
unsigned block_start, block_end, blocksize; unsigned to; struct buffer_head *bh, *head; int ret = 1; if (!page_has_buffers(page)) return 0; |
45bce8f3e fs/buffer.c: make... |
2170 2171 |
head = page_buffers(page); blocksize = head->b_size; |
09cbfeaf1 mm, fs: get rid o... |
2172 |
to = min_t(unsigned, PAGE_SIZE - from, count); |
8ab22b9ab vfs: pagecache us... |
2173 |
to = from + to; |
09cbfeaf1 mm, fs: get rid o... |
2174 |
if (from < blocksize && to > PAGE_SIZE - blocksize) |
8ab22b9ab vfs: pagecache us... |
2175 |
return 0; |
8ab22b9ab vfs: pagecache us... |
2176 2177 2178 2179 2180 2181 2182 2183 2184 2185 2186 2187 2188 2189 2190 2191 2192 2193 2194 2195 2196 |
bh = head; block_start = 0; do { block_end = block_start + blocksize; if (block_end > from && block_start < to) { if (!buffer_uptodate(bh)) { ret = 0; break; } if (block_end >= to) break; } block_start = block_end; bh = bh->b_this_page; } while (bh != head); return ret; } EXPORT_SYMBOL(block_is_partially_uptodate); /* |
1da177e4c Linux-2.6.12-rc2 |
2197 2198 2199 2200 2201 2202 2203 2204 2205 2206 2207 |
* Generic "read page" function for block devices that have the normal * get_block functionality. This is most of the block device filesystems. * Reads the page asynchronously --- the unlock_buffer() and * set/clear_buffer_uptodate() functions propagate buffer state into the * page struct once IO has completed. */ int block_read_full_page(struct page *page, get_block_t *get_block) { struct inode *inode = page->mapping->host; sector_t iblock, lblock; struct buffer_head *bh, *head, *arr[MAX_BUF_PER_PAGE]; |
45bce8f3e fs/buffer.c: make... |
2208 |
unsigned int blocksize, bbits; |
1da177e4c Linux-2.6.12-rc2 |
2209 2210 |
int nr, i; int fully_mapped = 1; |
45bce8f3e fs/buffer.c: make... |
2211 2212 2213 |
head = create_page_buffers(page, inode, 0); blocksize = head->b_size; bbits = block_size_bits(blocksize); |
1da177e4c Linux-2.6.12-rc2 |
2214 |
|
09cbfeaf1 mm, fs: get rid o... |
2215 |
iblock = (sector_t)page->index << (PAGE_SHIFT - bbits); |
45bce8f3e fs/buffer.c: make... |
2216 |
lblock = (i_size_read(inode)+blocksize-1) >> bbits; |
1da177e4c Linux-2.6.12-rc2 |
2217 2218 2219 2220 2221 2222 2223 2224 2225 |
bh = head; nr = 0; i = 0; do { if (buffer_uptodate(bh)) continue; if (!buffer_mapped(bh)) { |
c64610ba5 [PATCH] block_rea... |
2226 |
int err = 0; |
1da177e4c Linux-2.6.12-rc2 |
2227 2228 |
fully_mapped = 0; if (iblock < lblock) { |
b0cf2321c [PATCH] pass b_si... |
2229 |
WARN_ON(bh->b_size != blocksize); |
c64610ba5 [PATCH] block_rea... |
2230 2231 |
err = get_block(inode, iblock, bh, 0); if (err) |
1da177e4c Linux-2.6.12-rc2 |
2232 2233 2234 |
SetPageError(page); } if (!buffer_mapped(bh)) { |
eebd2aa35 Pagecache zeroing... |
2235 |
zero_user(page, i * blocksize, blocksize); |
c64610ba5 [PATCH] block_rea... |
2236 2237 |
if (!err) set_buffer_uptodate(bh); |
1da177e4c Linux-2.6.12-rc2 |
2238 2239 2240 2241 2242 2243 2244 2245 2246 2247 2248 2249 2250 2251 2252 2253 2254 2255 2256 2257 2258 2259 2260 2261 2262 2263 2264 2265 2266 2267 2268 2269 2270 2271 2272 2273 2274 2275 2276 2277 2278 2279 2280 |
continue; } /* * get_block() might have updated the buffer * synchronously */ if (buffer_uptodate(bh)) continue; } arr[nr++] = bh; } while (i++, iblock++, (bh = bh->b_this_page) != head); if (fully_mapped) SetPageMappedToDisk(page); if (!nr) { /* * All buffers are uptodate - we can set the page uptodate * as well. But not if get_block() returned an error. */ if (!PageError(page)) SetPageUptodate(page); unlock_page(page); return 0; } /* Stage two: lock the buffers */ for (i = 0; i < nr; i++) { bh = arr[i]; lock_buffer(bh); mark_buffer_async_read(bh); } /* * Stage 3: start the IO. Check for uptodateness * inside the buffer lock in case another process reading * the underlying blockdev brought it uptodate (the sct fix). */ for (i = 0; i < nr; i++) { bh = arr[i]; if (buffer_uptodate(bh)) end_buffer_async_read(bh, 1); else |
2a222ca99 fs: have submit_b... |
2281 |
submit_bh(REQ_OP_READ, 0, bh); |
1da177e4c Linux-2.6.12-rc2 |
2282 2283 2284 |
} return 0; } |
1fe72eaa0 fs/buffer.c: clea... |
2285 |
EXPORT_SYMBOL(block_read_full_page); |
1da177e4c Linux-2.6.12-rc2 |
2286 2287 |
/* utility function for filesystems that need to do work on expanding |
89e107877 fs: new cont helpers |
2288 |
* truncates. Uses filesystem pagecache writes to allow the filesystem to |
1da177e4c Linux-2.6.12-rc2 |
2289 2290 |
* deal with the hole. */ |
89e107877 fs: new cont helpers |
2291 |
int generic_cont_expand_simple(struct inode *inode, loff_t size) |
1da177e4c Linux-2.6.12-rc2 |
2292 2293 2294 |
{ struct address_space *mapping = inode->i_mapping; struct page *page; |
89e107877 fs: new cont helpers |
2295 |
void *fsdata; |
1da177e4c Linux-2.6.12-rc2 |
2296 |
int err; |
c08d3b0e3 truncate: use new... |
2297 2298 |
err = inode_newsize_ok(inode, size); if (err) |
1da177e4c Linux-2.6.12-rc2 |
2299 |
goto out; |
89e107877 fs: new cont helpers |
2300 2301 2302 2303 |
err = pagecache_write_begin(NULL, mapping, size, 0, AOP_FLAG_UNINTERRUPTIBLE|AOP_FLAG_CONT_EXPAND, &page, &fsdata); if (err) |
05eb0b51f [PATCH] fat: supp... |
2304 |
goto out; |
05eb0b51f [PATCH] fat: supp... |
2305 |
|
89e107877 fs: new cont helpers |
2306 2307 |
err = pagecache_write_end(NULL, mapping, size, 0, 0, page, fsdata); BUG_ON(err > 0); |
05eb0b51f [PATCH] fat: supp... |
2308 |
|
1da177e4c Linux-2.6.12-rc2 |
2309 2310 2311 |
out: return err; } |
1fe72eaa0 fs/buffer.c: clea... |
2312 |
EXPORT_SYMBOL(generic_cont_expand_simple); |
1da177e4c Linux-2.6.12-rc2 |
2313 |
|
f1e3af72c make fs/buffer.c:... |
2314 2315 |
static int cont_expand_zero(struct file *file, struct address_space *mapping, loff_t pos, loff_t *bytes) |
1da177e4c Linux-2.6.12-rc2 |
2316 |
{ |
1da177e4c Linux-2.6.12-rc2 |
2317 |
struct inode *inode = mapping->host; |
1da177e4c Linux-2.6.12-rc2 |
2318 |
unsigned blocksize = 1 << inode->i_blkbits; |
89e107877 fs: new cont helpers |
2319 2320 2321 2322 2323 2324 |
struct page *page; void *fsdata; pgoff_t index, curidx; loff_t curpos; unsigned zerofrom, offset, len; int err = 0; |
1da177e4c Linux-2.6.12-rc2 |
2325 |
|
09cbfeaf1 mm, fs: get rid o... |
2326 2327 |
index = pos >> PAGE_SHIFT; offset = pos & ~PAGE_MASK; |
89e107877 fs: new cont helpers |
2328 |
|
09cbfeaf1 mm, fs: get rid o... |
2329 2330 |
while (index > (curidx = (curpos = *bytes)>>PAGE_SHIFT)) { zerofrom = curpos & ~PAGE_MASK; |
1da177e4c Linux-2.6.12-rc2 |
2331 2332 2333 2334 |
if (zerofrom & (blocksize-1)) { *bytes |= (blocksize-1); (*bytes)++; } |
09cbfeaf1 mm, fs: get rid o... |
2335 |
len = PAGE_SIZE - zerofrom; |
1da177e4c Linux-2.6.12-rc2 |
2336 |
|
89e107877 fs: new cont helpers |
2337 2338 2339 2340 2341 |
err = pagecache_write_begin(file, mapping, curpos, len, AOP_FLAG_UNINTERRUPTIBLE, &page, &fsdata); if (err) goto out; |
eebd2aa35 Pagecache zeroing... |
2342 |
zero_user(page, zerofrom, len); |
89e107877 fs: new cont helpers |
2343 2344 2345 2346 2347 2348 |
err = pagecache_write_end(file, mapping, curpos, len, len, page, fsdata); if (err < 0) goto out; BUG_ON(err != len); err = 0; |
061e97469 Add balance_dirty... |
2349 2350 |
balance_dirty_pages_ratelimited(mapping); |
c2ca0fcd2 fs: make cont_exp... |
2351 2352 2353 2354 2355 |
if (unlikely(fatal_signal_pending(current))) { err = -EINTR; goto out; } |
89e107877 fs: new cont helpers |
2356 |
} |
1da177e4c Linux-2.6.12-rc2 |
2357 |
|
89e107877 fs: new cont helpers |
2358 2359 |
/* page covers the boundary, find the boundary offset */ if (index == curidx) { |
09cbfeaf1 mm, fs: get rid o... |
2360 |
zerofrom = curpos & ~PAGE_MASK; |
1da177e4c Linux-2.6.12-rc2 |
2361 |
/* if we will expand the thing last block will be filled */ |
89e107877 fs: new cont helpers |
2362 2363 2364 2365 |
if (offset <= zerofrom) { goto out; } if (zerofrom & (blocksize-1)) { |
1da177e4c Linux-2.6.12-rc2 |
2366 2367 2368 |
*bytes |= (blocksize-1); (*bytes)++; } |
89e107877 fs: new cont helpers |
2369 |
len = offset - zerofrom; |
1da177e4c Linux-2.6.12-rc2 |
2370 |
|
89e107877 fs: new cont helpers |
2371 2372 2373 2374 2375 |
err = pagecache_write_begin(file, mapping, curpos, len, AOP_FLAG_UNINTERRUPTIBLE, &page, &fsdata); if (err) goto out; |
eebd2aa35 Pagecache zeroing... |
2376 |
zero_user(page, zerofrom, len); |
89e107877 fs: new cont helpers |
2377 2378 2379 2380 2381 2382 |
err = pagecache_write_end(file, mapping, curpos, len, len, page, fsdata); if (err < 0) goto out; BUG_ON(err != len); err = 0; |
1da177e4c Linux-2.6.12-rc2 |
2383 |
} |
89e107877 fs: new cont helpers |
2384 2385 2386 2387 2388 2389 2390 2391 |
out: return err; } /* * For moronic filesystems that do not allow holes in file. * We may have to extend the file. */ |
282dc1788 get rid of cont_w... |
2392 |
int cont_write_begin(struct file *file, struct address_space *mapping, |
89e107877 fs: new cont helpers |
2393 2394 2395 2396 2397 2398 2399 2400 2401 2402 2403 |
loff_t pos, unsigned len, unsigned flags, struct page **pagep, void **fsdata, get_block_t *get_block, loff_t *bytes) { struct inode *inode = mapping->host; unsigned blocksize = 1 << inode->i_blkbits; unsigned zerofrom; int err; err = cont_expand_zero(file, mapping, pos, bytes); if (err) |
155130a4f get rid of block_... |
2404 |
return err; |
89e107877 fs: new cont helpers |
2405 |
|
09cbfeaf1 mm, fs: get rid o... |
2406 |
zerofrom = *bytes & ~PAGE_MASK; |
89e107877 fs: new cont helpers |
2407 2408 2409 |
if (pos+len > *bytes && zerofrom & (blocksize-1)) { *bytes |= (blocksize-1); (*bytes)++; |
1da177e4c Linux-2.6.12-rc2 |
2410 |
} |
1da177e4c Linux-2.6.12-rc2 |
2411 |
|
155130a4f get rid of block_... |
2412 |
return block_write_begin(mapping, pos, len, flags, pagep, get_block); |
1da177e4c Linux-2.6.12-rc2 |
2413 |
} |
1fe72eaa0 fs/buffer.c: clea... |
2414 |
EXPORT_SYMBOL(cont_write_begin); |
1da177e4c Linux-2.6.12-rc2 |
2415 |
|
1da177e4c Linux-2.6.12-rc2 |
2416 2417 2418 2419 2420 2421 |
int block_commit_write(struct page *page, unsigned from, unsigned to) { struct inode *inode = page->mapping->host; __block_commit_write(inode,page,from,to); return 0; } |
1fe72eaa0 fs/buffer.c: clea... |
2422 |
EXPORT_SYMBOL(block_commit_write); |
1da177e4c Linux-2.6.12-rc2 |
2423 |
|
541716902 [FS] Implement bl... |
2424 2425 2426 2427 2428 2429 2430 2431 2432 2433 |
/* * block_page_mkwrite() is not allowed to change the file size as it gets * called from a page fault handler when a page is first dirtied. Hence we must * be careful to check for EOF conditions here. We set the page up correctly * for a written page which means we get ENOSPC checking when writing into * holes and correct delalloc and unwritten extent mapping on filesystems that * support these features. * * We are not allowed to take the i_mutex here so we have to play games to * protect against truncate races as the page could now be beyond EOF. Because |
7bb46a673 fs: introduce new... |
2434 |
* truncate writes the inode size before removing pages, once we have the |
541716902 [FS] Implement bl... |
2435 2436 2437 |
* page lock we can determine safely if the page is beyond EOF. If it is not * beyond EOF, then the page is guaranteed safe against truncation until we * unlock the page. |
ea13a8646 vfs: Block mmappe... |
2438 |
* |
14da92001 fs: Protect write... |
2439 |
* Direct callers of this function should protect against filesystem freezing |
5c5000296 vfs: remove unuse... |
2440 |
* using sb_start_pagefault() - sb_end_pagefault() functions. |
541716902 [FS] Implement bl... |
2441 |
*/ |
5c5000296 vfs: remove unuse... |
2442 |
int block_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf, |
24da4fab5 vfs: Create __blo... |
2443 |
get_block_t get_block) |
541716902 [FS] Implement bl... |
2444 |
{ |
c2ec175c3 mm: page_mkwrite ... |
2445 |
struct page *page = vmf->page; |
496ad9aa8 new helper: file_... |
2446 |
struct inode *inode = file_inode(vma->vm_file); |
541716902 [FS] Implement bl... |
2447 2448 |
unsigned long end; loff_t size; |
24da4fab5 vfs: Create __blo... |
2449 |
int ret; |
541716902 [FS] Implement bl... |
2450 2451 2452 2453 |
lock_page(page); size = i_size_read(inode); if ((page->mapping != inode->i_mapping) || |
183363380 fix some conversi... |
2454 |
(page_offset(page) > size)) { |
24da4fab5 vfs: Create __blo... |
2455 2456 2457 |
/* We overload EFAULT to mean page got truncated */ ret = -EFAULT; goto out_unlock; |
541716902 [FS] Implement bl... |
2458 2459 2460 |
} /* page is wholly or partially inside EOF */ |
09cbfeaf1 mm, fs: get rid o... |
2461 2462 |
if (((page->index + 1) << PAGE_SHIFT) > size) end = size & ~PAGE_MASK; |
541716902 [FS] Implement bl... |
2463 |
else |
09cbfeaf1 mm, fs: get rid o... |
2464 |
end = PAGE_SIZE; |
541716902 [FS] Implement bl... |
2465 |
|
ebdec241d fs: kill block_pr... |
2466 |
ret = __block_write_begin(page, 0, end, get_block); |
541716902 [FS] Implement bl... |
2467 2468 |
if (!ret) ret = block_commit_write(page, 0, end); |
24da4fab5 vfs: Create __blo... |
2469 2470 |
if (unlikely(ret < 0)) goto out_unlock; |
ea13a8646 vfs: Block mmappe... |
2471 |
set_page_dirty(page); |
1d1d1a767 mm: only enforce ... |
2472 |
wait_for_stable_page(page); |
24da4fab5 vfs: Create __blo... |
2473 2474 2475 |
return 0; out_unlock: unlock_page(page); |
541716902 [FS] Implement bl... |
2476 |
return ret; |
24da4fab5 vfs: Create __blo... |
2477 |
} |
1fe72eaa0 fs/buffer.c: clea... |
2478 |
EXPORT_SYMBOL(block_page_mkwrite); |
1da177e4c Linux-2.6.12-rc2 |
2479 2480 |
/* |
03158cd7e fs: restore nobh |
2481 |
* nobh_write_begin()'s prereads are special: the buffer_heads are freed |
1da177e4c Linux-2.6.12-rc2 |
2482 2483 |
* immediately, while under the page lock. So it needs a special end_io * handler which does not touch the bh after unlocking it. |
1da177e4c Linux-2.6.12-rc2 |
2484 2485 2486 |
*/ static void end_buffer_read_nobh(struct buffer_head *bh, int uptodate) { |
68671f35f mm: add end_buffe... |
2487 |
__end_buffer_read_notouch(bh, uptodate); |
1da177e4c Linux-2.6.12-rc2 |
2488 2489 2490 |
} /* |
03158cd7e fs: restore nobh |
2491 2492 2493 2494 2495 2496 2497 2498 2499 2500 2501 2502 2503 2504 2505 2506 2507 2508 2509 2510 2511 2512 2513 2514 |
* Attach the singly-linked list of buffers created by nobh_write_begin, to * the page (converting it to circular linked list and taking care of page * dirty races). */ static void attach_nobh_buffers(struct page *page, struct buffer_head *head) { struct buffer_head *bh; BUG_ON(!PageLocked(page)); spin_lock(&page->mapping->private_lock); bh = head; do { if (PageDirty(page)) set_buffer_dirty(bh); if (!bh->b_this_page) bh->b_this_page = head; bh = bh->b_this_page; } while (bh != head); attach_page_buffers(page, head); spin_unlock(&page->mapping->private_lock); } /* |
ea0f04e59 get rid of nobh_w... |
2515 2516 |
* On entry, the page is fully not uptodate. * On exit the page is fully uptodate in the areas outside (from,to) |
7bb46a673 fs: introduce new... |
2517 |
* The filesystem needs to handle block truncation upon failure. |
1da177e4c Linux-2.6.12-rc2 |
2518 |
*/ |
ea0f04e59 get rid of nobh_w... |
2519 |
int nobh_write_begin(struct address_space *mapping, |
03158cd7e fs: restore nobh |
2520 2521 |
loff_t pos, unsigned len, unsigned flags, struct page **pagep, void **fsdata, |
1da177e4c Linux-2.6.12-rc2 |
2522 2523 |
get_block_t *get_block) { |
03158cd7e fs: restore nobh |
2524 |
struct inode *inode = mapping->host; |
1da177e4c Linux-2.6.12-rc2 |
2525 2526 |
const unsigned blkbits = inode->i_blkbits; const unsigned blocksize = 1 << blkbits; |
a4b0672db fs: fix nobh erro... |
2527 |
struct buffer_head *head, *bh; |
03158cd7e fs: restore nobh |
2528 2529 2530 |
struct page *page; pgoff_t index; unsigned from, to; |
1da177e4c Linux-2.6.12-rc2 |
2531 |
unsigned block_in_page; |
a4b0672db fs: fix nobh erro... |
2532 |
unsigned block_start, block_end; |
1da177e4c Linux-2.6.12-rc2 |
2533 |
sector_t block_in_file; |
1da177e4c Linux-2.6.12-rc2 |
2534 |
int nr_reads = 0; |
1da177e4c Linux-2.6.12-rc2 |
2535 2536 |
int ret = 0; int is_mapped_to_disk = 1; |
1da177e4c Linux-2.6.12-rc2 |
2537 |
|
09cbfeaf1 mm, fs: get rid o... |
2538 2539 |
index = pos >> PAGE_SHIFT; from = pos & (PAGE_SIZE - 1); |
03158cd7e fs: restore nobh |
2540 |
to = from + len; |
54566b2c1 fs: symlink write... |
2541 |
page = grab_cache_page_write_begin(mapping, index, flags); |
03158cd7e fs: restore nobh |
2542 2543 2544 2545 2546 2547 |
if (!page) return -ENOMEM; *pagep = page; *fsdata = NULL; if (page_has_buffers(page)) { |
309f77ad9 fs/buffer.c: call... |
2548 2549 2550 2551 |
ret = __block_write_begin(page, pos, len, get_block); if (unlikely(ret)) goto out_release; return ret; |
03158cd7e fs: restore nobh |
2552 |
} |
a4b0672db fs: fix nobh erro... |
2553 |
|
1da177e4c Linux-2.6.12-rc2 |
2554 2555 |
if (PageMappedToDisk(page)) return 0; |
a4b0672db fs: fix nobh erro... |
2556 2557 2558 2559 2560 2561 2562 2563 2564 2565 |
/* * Allocate buffers so that we can keep track of state, and potentially * attach them to the page if an error occurs. In the common case of * no error, they will just be freed again without ever being attached * to the page (which is all OK, because we're under the page lock). * * Be careful: the buffer linked list is a NULL terminated one, rather * than the circular one we're used to. */ head = alloc_page_buffers(page, blocksize, 0); |
03158cd7e fs: restore nobh |
2566 2567 2568 2569 |
if (!head) { ret = -ENOMEM; goto out_release; } |
a4b0672db fs: fix nobh erro... |
2570 |
|
09cbfeaf1 mm, fs: get rid o... |
2571 |
block_in_file = (sector_t)page->index << (PAGE_SHIFT - blkbits); |
1da177e4c Linux-2.6.12-rc2 |
2572 2573 2574 2575 2576 2577 |
/* * We loop across all blocks in the page, whether or not they are * part of the affected region. This is so we can discover if the * page is fully mapped-to-disk. */ |
a4b0672db fs: fix nobh erro... |
2578 |
for (block_start = 0, block_in_page = 0, bh = head; |
09cbfeaf1 mm, fs: get rid o... |
2579 |
block_start < PAGE_SIZE; |
a4b0672db fs: fix nobh erro... |
2580 |
block_in_page++, block_start += blocksize, bh = bh->b_this_page) { |
1da177e4c Linux-2.6.12-rc2 |
2581 |
int create; |
a4b0672db fs: fix nobh erro... |
2582 2583 |
block_end = block_start + blocksize; bh->b_state = 0; |
1da177e4c Linux-2.6.12-rc2 |
2584 2585 2586 2587 |
create = 1; if (block_start >= to) create = 0; ret = get_block(inode, block_in_file + block_in_page, |
a4b0672db fs: fix nobh erro... |
2588 |
bh, create); |
1da177e4c Linux-2.6.12-rc2 |
2589 2590 |
if (ret) goto failed; |
a4b0672db fs: fix nobh erro... |
2591 |
if (!buffer_mapped(bh)) |
1da177e4c Linux-2.6.12-rc2 |
2592 |
is_mapped_to_disk = 0; |
a4b0672db fs: fix nobh erro... |
2593 2594 2595 2596 |
if (buffer_new(bh)) unmap_underlying_metadata(bh->b_bdev, bh->b_blocknr); if (PageUptodate(page)) { set_buffer_uptodate(bh); |
1da177e4c Linux-2.6.12-rc2 |
2597 |
continue; |
a4b0672db fs: fix nobh erro... |
2598 2599 |
} if (buffer_new(bh) || !buffer_mapped(bh)) { |
eebd2aa35 Pagecache zeroing... |
2600 2601 |
zero_user_segments(page, block_start, from, to, block_end); |
1da177e4c Linux-2.6.12-rc2 |
2602 2603 |
continue; } |
a4b0672db fs: fix nobh erro... |
2604 |
if (buffer_uptodate(bh)) |
1da177e4c Linux-2.6.12-rc2 |
2605 2606 |
continue; /* reiserfs does this */ if (block_start < from || block_end > to) { |
a4b0672db fs: fix nobh erro... |
2607 2608 |
lock_buffer(bh); bh->b_end_io = end_buffer_read_nobh; |
2a222ca99 fs: have submit_b... |
2609 |
submit_bh(REQ_OP_READ, 0, bh); |
a4b0672db fs: fix nobh erro... |
2610 |
nr_reads++; |
1da177e4c Linux-2.6.12-rc2 |
2611 2612 2613 2614 |
} } if (nr_reads) { |
1da177e4c Linux-2.6.12-rc2 |
2615 2616 2617 2618 2619 |
/* * The page is locked, so these buffers are protected from * any VM or truncate activity. Hence we don't need to care * for the buffer_head refcounts. */ |
a4b0672db fs: fix nobh erro... |
2620 |
for (bh = head; bh; bh = bh->b_this_page) { |
1da177e4c Linux-2.6.12-rc2 |
2621 2622 2623 |
wait_on_buffer(bh); if (!buffer_uptodate(bh)) ret = -EIO; |
1da177e4c Linux-2.6.12-rc2 |
2624 2625 2626 2627 2628 2629 2630 |
} if (ret) goto failed; } if (is_mapped_to_disk) SetPageMappedToDisk(page); |
1da177e4c Linux-2.6.12-rc2 |
2631 |
|
03158cd7e fs: restore nobh |
2632 |
*fsdata = head; /* to be released by nobh_write_end */ |
a4b0672db fs: fix nobh erro... |
2633 |
|
1da177e4c Linux-2.6.12-rc2 |
2634 2635 2636 |
return 0; failed: |
03158cd7e fs: restore nobh |
2637 |
BUG_ON(!ret); |
1da177e4c Linux-2.6.12-rc2 |
2638 |
/* |
a4b0672db fs: fix nobh erro... |
2639 2640 2641 2642 2643 |
* Error recovery is a bit difficult. We need to zero out blocks that * were newly allocated, and dirty them to ensure they get written out. * Buffers need to be attached to the page at this point, otherwise * the handling of potential IO errors during writeout would be hard * (could try doing synchronous writeout, but what if that fails too?) |
1da177e4c Linux-2.6.12-rc2 |
2644 |
*/ |
03158cd7e fs: restore nobh |
2645 2646 |
attach_nobh_buffers(page, head); page_zero_new_buffers(page, from, to); |
a4b0672db fs: fix nobh erro... |
2647 |
|
03158cd7e fs: restore nobh |
2648 2649 |
out_release: unlock_page(page); |
09cbfeaf1 mm, fs: get rid o... |
2650 |
put_page(page); |
03158cd7e fs: restore nobh |
2651 |
*pagep = NULL; |
a4b0672db fs: fix nobh erro... |
2652 |
|
7bb46a673 fs: introduce new... |
2653 2654 |
return ret; } |
03158cd7e fs: restore nobh |
2655 |
EXPORT_SYMBOL(nobh_write_begin); |
1da177e4c Linux-2.6.12-rc2 |
2656 |
|
03158cd7e fs: restore nobh |
2657 2658 2659 |
int nobh_write_end(struct file *file, struct address_space *mapping, loff_t pos, unsigned len, unsigned copied, struct page *page, void *fsdata) |
1da177e4c Linux-2.6.12-rc2 |
2660 2661 |
{ struct inode *inode = page->mapping->host; |
efdc31319 nobh: nobh_write_... |
2662 |
struct buffer_head *head = fsdata; |
03158cd7e fs: restore nobh |
2663 |
struct buffer_head *bh; |
5b41e74ad vfs: fix data lea... |
2664 |
BUG_ON(fsdata != NULL && page_has_buffers(page)); |
1da177e4c Linux-2.6.12-rc2 |
2665 |
|
d4cf109f0 vfs: Don't call a... |
2666 |
if (unlikely(copied < len) && head) |
5b41e74ad vfs: fix data lea... |
2667 2668 2669 2670 |
attach_nobh_buffers(page, head); if (page_has_buffers(page)) return generic_write_end(file, mapping, pos, len, copied, page, fsdata); |
a4b0672db fs: fix nobh erro... |
2671 |
|
22c8ca78f [PATCH] fs: fix n... |
2672 |
SetPageUptodate(page); |
1da177e4c Linux-2.6.12-rc2 |
2673 |
set_page_dirty(page); |
03158cd7e fs: restore nobh |
2674 2675 |
if (pos+copied > inode->i_size) { i_size_write(inode, pos+copied); |
1da177e4c Linux-2.6.12-rc2 |
2676 2677 |
mark_inode_dirty(inode); } |
03158cd7e fs: restore nobh |
2678 2679 |
unlock_page(page); |
09cbfeaf1 mm, fs: get rid o... |
2680 |
put_page(page); |
03158cd7e fs: restore nobh |
2681 |
|
03158cd7e fs: restore nobh |
2682 2683 2684 2685 2686 2687 2688 |
while (head) { bh = head; head = head->b_this_page; free_buffer_head(bh); } return copied; |
1da177e4c Linux-2.6.12-rc2 |
2689 |
} |
03158cd7e fs: restore nobh |
2690 |
EXPORT_SYMBOL(nobh_write_end); |
1da177e4c Linux-2.6.12-rc2 |
2691 2692 2693 2694 2695 2696 2697 2698 2699 2700 2701 |
/* * nobh_writepage() - based on block_full_write_page() except * that it tries to operate without attaching bufferheads to * the page. */ int nobh_writepage(struct page *page, get_block_t *get_block, struct writeback_control *wbc) { struct inode * const inode = page->mapping->host; loff_t i_size = i_size_read(inode); |
09cbfeaf1 mm, fs: get rid o... |
2702 |
const pgoff_t end_index = i_size >> PAGE_SHIFT; |
1da177e4c Linux-2.6.12-rc2 |
2703 |
unsigned offset; |
1da177e4c Linux-2.6.12-rc2 |
2704 2705 2706 2707 2708 2709 2710 |
int ret; /* Is the page fully inside i_size? */ if (page->index < end_index) goto out; /* Is the page fully outside i_size? (truncate in progress) */ |
09cbfeaf1 mm, fs: get rid o... |
2711 |
offset = i_size & (PAGE_SIZE-1); |
1da177e4c Linux-2.6.12-rc2 |
2712 2713 2714 2715 2716 2717 2718 2719 2720 2721 2722 2723 2724 2725 2726 2727 2728 2729 2730 2731 2732 2733 |
if (page->index >= end_index+1 || !offset) { /* * The page may have dirty, unmapped buffers. For example, * they may have been added in ext3_writepage(). Make them * freeable here, so the page does not leak. */ #if 0 /* Not really sure about this - do we need this ? */ if (page->mapping->a_ops->invalidatepage) page->mapping->a_ops->invalidatepage(page, offset); #endif unlock_page(page); return 0; /* don't care */ } /* * The page straddles i_size. It must be zeroed out on each and every * writepage invocation because it may be mmapped. "A file is mapped * in multiples of the page size. For a file that is not a multiple of * the page size, the remaining memory is zeroed when mapped, and * writes to that region are not written out to the file." */ |
09cbfeaf1 mm, fs: get rid o... |
2734 |
zero_user_segment(page, offset, PAGE_SIZE); |
1da177e4c Linux-2.6.12-rc2 |
2735 2736 2737 |
out: ret = mpage_writepage(page, get_block, wbc); if (ret == -EAGAIN) |
35c80d5f4 Add block_write_f... |
2738 2739 |
ret = __block_write_full_page(inode, page, get_block, wbc, end_buffer_async_write); |
1da177e4c Linux-2.6.12-rc2 |
2740 2741 2742 |
return ret; } EXPORT_SYMBOL(nobh_writepage); |
03158cd7e fs: restore nobh |
2743 2744 |
int nobh_truncate_page(struct address_space *mapping, loff_t from, get_block_t *get_block) |
1da177e4c Linux-2.6.12-rc2 |
2745 |
{ |
09cbfeaf1 mm, fs: get rid o... |
2746 2747 |
pgoff_t index = from >> PAGE_SHIFT; unsigned offset = from & (PAGE_SIZE-1); |
03158cd7e fs: restore nobh |
2748 2749 2750 2751 |
unsigned blocksize; sector_t iblock; unsigned length, pos; struct inode *inode = mapping->host; |
1da177e4c Linux-2.6.12-rc2 |
2752 |
struct page *page; |
03158cd7e fs: restore nobh |
2753 2754 |
struct buffer_head map_bh; int err; |
1da177e4c Linux-2.6.12-rc2 |
2755 |
|
03158cd7e fs: restore nobh |
2756 2757 2758 2759 2760 2761 2762 2763 |
blocksize = 1 << inode->i_blkbits; length = offset & (blocksize - 1); /* Block boundary? Nothing to do */ if (!length) return 0; length = blocksize - length; |
09cbfeaf1 mm, fs: get rid o... |
2764 |
iblock = (sector_t)index << (PAGE_SHIFT - inode->i_blkbits); |
1da177e4c Linux-2.6.12-rc2 |
2765 |
|
1da177e4c Linux-2.6.12-rc2 |
2766 |
page = grab_cache_page(mapping, index); |
03158cd7e fs: restore nobh |
2767 |
err = -ENOMEM; |
1da177e4c Linux-2.6.12-rc2 |
2768 2769 |
if (!page) goto out; |
03158cd7e fs: restore nobh |
2770 2771 2772 |
if (page_has_buffers(page)) { has_buffers: unlock_page(page); |
09cbfeaf1 mm, fs: get rid o... |
2773 |
put_page(page); |
03158cd7e fs: restore nobh |
2774 2775 2776 2777 2778 2779 2780 2781 2782 |
return block_truncate_page(mapping, from, get_block); } /* Find the buffer that contains "offset" */ pos = blocksize; while (offset >= pos) { iblock++; pos += blocksize; } |
460bcf57b Fix nobh_truncate... |
2783 2784 |
map_bh.b_size = blocksize; map_bh.b_state = 0; |
03158cd7e fs: restore nobh |
2785 2786 2787 2788 2789 2790 2791 2792 2793 2794 2795 |
err = get_block(inode, iblock, &map_bh, 0); if (err) goto unlock; /* unmapped? It's a hole - nothing to do */ if (!buffer_mapped(&map_bh)) goto unlock; /* Ok, it's mapped. Make sure it's up-to-date */ if (!PageUptodate(page)) { err = mapping->a_ops->readpage(NULL, page); if (err) { |
09cbfeaf1 mm, fs: get rid o... |
2796 |
put_page(page); |
03158cd7e fs: restore nobh |
2797 2798 2799 2800 2801 2802 2803 2804 2805 |
goto out; } lock_page(page); if (!PageUptodate(page)) { err = -EIO; goto unlock; } if (page_has_buffers(page)) goto has_buffers; |
1da177e4c Linux-2.6.12-rc2 |
2806 |
} |
eebd2aa35 Pagecache zeroing... |
2807 |
zero_user(page, offset, length); |
03158cd7e fs: restore nobh |
2808 2809 2810 2811 |
set_page_dirty(page); err = 0; unlock: |
1da177e4c Linux-2.6.12-rc2 |
2812 |
unlock_page(page); |
09cbfeaf1 mm, fs: get rid o... |
2813 |
put_page(page); |
1da177e4c Linux-2.6.12-rc2 |
2814 |
out: |
03158cd7e fs: restore nobh |
2815 |
return err; |
1da177e4c Linux-2.6.12-rc2 |
2816 2817 2818 2819 2820 2821 |
} EXPORT_SYMBOL(nobh_truncate_page); int block_truncate_page(struct address_space *mapping, loff_t from, get_block_t *get_block) { |
09cbfeaf1 mm, fs: get rid o... |
2822 2823 |
pgoff_t index = from >> PAGE_SHIFT; unsigned offset = from & (PAGE_SIZE-1); |
1da177e4c Linux-2.6.12-rc2 |
2824 |
unsigned blocksize; |
54b21a799 [PATCH] fix possi... |
2825 |
sector_t iblock; |
1da177e4c Linux-2.6.12-rc2 |
2826 2827 2828 2829 |
unsigned length, pos; struct inode *inode = mapping->host; struct page *page; struct buffer_head *bh; |
1da177e4c Linux-2.6.12-rc2 |
2830 2831 2832 2833 2834 2835 2836 2837 2838 2839 |
int err; blocksize = 1 << inode->i_blkbits; length = offset & (blocksize - 1); /* Block boundary? Nothing to do */ if (!length) return 0; length = blocksize - length; |
09cbfeaf1 mm, fs: get rid o... |
2840 |
iblock = (sector_t)index << (PAGE_SHIFT - inode->i_blkbits); |
1da177e4c Linux-2.6.12-rc2 |
2841 2842 2843 2844 2845 2846 2847 2848 2849 2850 2851 2852 2853 2854 2855 2856 2857 2858 2859 2860 |
page = grab_cache_page(mapping, index); err = -ENOMEM; if (!page) goto out; if (!page_has_buffers(page)) create_empty_buffers(page, blocksize, 0); /* Find the buffer that contains "offset" */ bh = page_buffers(page); pos = blocksize; while (offset >= pos) { bh = bh->b_this_page; iblock++; pos += blocksize; } err = 0; if (!buffer_mapped(bh)) { |
b0cf2321c [PATCH] pass b_si... |
2861 |
WARN_ON(bh->b_size != blocksize); |
1da177e4c Linux-2.6.12-rc2 |
2862 2863 2864 2865 2866 2867 2868 2869 2870 2871 2872 |
err = get_block(inode, iblock, bh, 0); if (err) goto unlock; /* unmapped? It's a hole - nothing to do */ if (!buffer_mapped(bh)) goto unlock; } /* Ok, it's mapped. Make sure it's up-to-date */ if (PageUptodate(page)) set_buffer_uptodate(bh); |
33a266dda [PATCH] Make BH_U... |
2873 |
if (!buffer_uptodate(bh) && !buffer_delay(bh) && !buffer_unwritten(bh)) { |
1da177e4c Linux-2.6.12-rc2 |
2874 |
err = -EIO; |
dfec8a14f fs: have ll_rw_bl... |
2875 |
ll_rw_block(REQ_OP_READ, 0, 1, &bh); |
1da177e4c Linux-2.6.12-rc2 |
2876 2877 2878 2879 2880 |
wait_on_buffer(bh); /* Uhhuh. Read error. Complain and punt. */ if (!buffer_uptodate(bh)) goto unlock; } |
eebd2aa35 Pagecache zeroing... |
2881 |
zero_user(page, offset, length); |
1da177e4c Linux-2.6.12-rc2 |
2882 2883 2884 2885 2886 |
mark_buffer_dirty(bh); err = 0; unlock: unlock_page(page); |
09cbfeaf1 mm, fs: get rid o... |
2887 |
put_page(page); |
1da177e4c Linux-2.6.12-rc2 |
2888 2889 2890 |
out: return err; } |
1fe72eaa0 fs/buffer.c: clea... |
2891 |
EXPORT_SYMBOL(block_truncate_page); |
1da177e4c Linux-2.6.12-rc2 |
2892 2893 2894 2895 |
/* * The generic ->writepage function for buffer-backed address_spaces */ |
1b938c082 fs/buffer.c: remo... |
2896 2897 |
int block_write_full_page(struct page *page, get_block_t *get_block, struct writeback_control *wbc) |
1da177e4c Linux-2.6.12-rc2 |
2898 2899 2900 |
{ struct inode * const inode = page->mapping->host; loff_t i_size = i_size_read(inode); |
09cbfeaf1 mm, fs: get rid o... |
2901 |
const pgoff_t end_index = i_size >> PAGE_SHIFT; |
1da177e4c Linux-2.6.12-rc2 |
2902 |
unsigned offset; |
1da177e4c Linux-2.6.12-rc2 |
2903 2904 2905 |
/* Is the page fully inside i_size? */ if (page->index < end_index) |
35c80d5f4 Add block_write_f... |
2906 |
return __block_write_full_page(inode, page, get_block, wbc, |
1b938c082 fs/buffer.c: remo... |
2907 |
end_buffer_async_write); |
1da177e4c Linux-2.6.12-rc2 |
2908 2909 |
/* Is the page fully outside i_size? (truncate in progress) */ |
09cbfeaf1 mm, fs: get rid o... |
2910 |
offset = i_size & (PAGE_SIZE-1); |
1da177e4c Linux-2.6.12-rc2 |
2911 2912 2913 2914 2915 2916 |
if (page->index >= end_index+1 || !offset) { /* * The page may have dirty, unmapped buffers. For example, * they may have been added in ext3_writepage(). Make them * freeable here, so the page does not leak. */ |
09cbfeaf1 mm, fs: get rid o... |
2917 |
do_invalidatepage(page, 0, PAGE_SIZE); |
1da177e4c Linux-2.6.12-rc2 |
2918 2919 2920 2921 2922 2923 |
unlock_page(page); return 0; /* don't care */ } /* * The page straddles i_size. It must be zeroed out on each and every |
2a61aa401 Fix misspellings ... |
2924 |
* writepage invocation because it may be mmapped. "A file is mapped |
1da177e4c Linux-2.6.12-rc2 |
2925 2926 2927 2928 |
* in multiples of the page size. For a file that is not a multiple of * the page size, the remaining memory is zeroed when mapped, and * writes to that region are not written out to the file." */ |
09cbfeaf1 mm, fs: get rid o... |
2929 |
zero_user_segment(page, offset, PAGE_SIZE); |
1b938c082 fs/buffer.c: remo... |
2930 2931 |
return __block_write_full_page(inode, page, get_block, wbc, end_buffer_async_write); |
35c80d5f4 Add block_write_f... |
2932 |
} |
1fe72eaa0 fs/buffer.c: clea... |
2933 |
EXPORT_SYMBOL(block_write_full_page); |
35c80d5f4 Add block_write_f... |
2934 |
|
1da177e4c Linux-2.6.12-rc2 |
2935 2936 2937 2938 2939 2940 2941 |
sector_t generic_block_bmap(struct address_space *mapping, sector_t block, get_block_t *get_block) { struct buffer_head tmp; struct inode *inode = mapping->host; tmp.b_state = 0; tmp.b_blocknr = 0; |
b0cf2321c [PATCH] pass b_si... |
2942 |
tmp.b_size = 1 << inode->i_blkbits; |
1da177e4c Linux-2.6.12-rc2 |
2943 2944 2945 |
get_block(inode, block, &tmp, 0); return tmp.b_blocknr; } |
1fe72eaa0 fs/buffer.c: clea... |
2946 |
EXPORT_SYMBOL(generic_block_bmap); |
1da177e4c Linux-2.6.12-rc2 |
2947 |
|
4246a0b63 block: add a bi_e... |
2948 |
static void end_bio_bh_io_sync(struct bio *bio) |
1da177e4c Linux-2.6.12-rc2 |
2949 2950 |
{ struct buffer_head *bh = bio->bi_private; |
b7c44ed9d block: manipulate... |
2951 |
if (unlikely(bio_flagged(bio, BIO_QUIET))) |
08bafc034 block: Supress Bu... |
2952 |
set_bit(BH_Quiet, &bh->b_state); |
4246a0b63 block: add a bi_e... |
2953 |
bh->b_end_io(bh, !bio->bi_error); |
1da177e4c Linux-2.6.12-rc2 |
2954 |
bio_put(bio); |
1da177e4c Linux-2.6.12-rc2 |
2955 |
} |
57302e0dd vfs: avoid "attem... |
2956 2957 |
/* * This allows us to do IO even on the odd last sectors |
59d43914e vfs: make guard_b... |
2958 |
* of a device, even if the block size is some multiple |
57302e0dd vfs: avoid "attem... |
2959 2960 2961 2962 2963 2964 2965 2966 2967 |
* of the physical sector size. * * We'll just truncate the bio to the size of the device, * and clear the end of the buffer head manually. * * Truly out-of-range accesses will turn into actual IO * errors, this only handles the "we need to be able to * do IO at the final sector" case. */ |
2a222ca99 fs: have submit_b... |
2968 |
void guard_bio_eod(int op, struct bio *bio) |
57302e0dd vfs: avoid "attem... |
2969 2970 |
{ sector_t maxsector; |
59d43914e vfs: make guard_b... |
2971 2972 |
struct bio_vec *bvec = &bio->bi_io_vec[bio->bi_vcnt - 1]; unsigned truncated_bytes; |
57302e0dd vfs: avoid "attem... |
2973 2974 2975 2976 2977 2978 2979 2980 2981 2982 |
maxsector = i_size_read(bio->bi_bdev->bd_inode) >> 9; if (!maxsector) return; /* * If the *whole* IO is past the end of the device, * let it through, and the IO layer will turn it into * an EIO. */ |
4f024f379 block: Abstract o... |
2983 |
if (unlikely(bio->bi_iter.bi_sector >= maxsector)) |
57302e0dd vfs: avoid "attem... |
2984 |
return; |
4f024f379 block: Abstract o... |
2985 |
maxsector -= bio->bi_iter.bi_sector; |
59d43914e vfs: make guard_b... |
2986 |
if (likely((bio->bi_iter.bi_size >> 9) <= maxsector)) |
57302e0dd vfs: avoid "attem... |
2987 |
return; |
59d43914e vfs: make guard_b... |
2988 2989 |
/* Uhhuh. We've got a bio that straddles the device size! */ truncated_bytes = bio->bi_iter.bi_size - (maxsector << 9); |
57302e0dd vfs: avoid "attem... |
2990 2991 |
/* Truncate the bio.. */ |
59d43914e vfs: make guard_b... |
2992 2993 |
bio->bi_iter.bi_size -= truncated_bytes; bvec->bv_len -= truncated_bytes; |
57302e0dd vfs: avoid "attem... |
2994 2995 |
/* ..and clear the end of the buffer for reads */ |
2a222ca99 fs: have submit_b... |
2996 |
if (op == REQ_OP_READ) { |
59d43914e vfs: make guard_b... |
2997 2998 |
zero_user(bvec->bv_page, bvec->bv_offset + bvec->bv_len, truncated_bytes); |
57302e0dd vfs: avoid "attem... |
2999 3000 |
} } |
2a222ca99 fs: have submit_b... |
3001 |
static int submit_bh_wbc(int op, int op_flags, struct buffer_head *bh, |
b16b1deb5 writeback: make w... |
3002 |
unsigned long bio_flags, struct writeback_control *wbc) |
1da177e4c Linux-2.6.12-rc2 |
3003 3004 |
{ struct bio *bio; |
1da177e4c Linux-2.6.12-rc2 |
3005 3006 3007 3008 |
BUG_ON(!buffer_locked(bh)); BUG_ON(!buffer_mapped(bh)); BUG_ON(!bh->b_end_io); |
8fb0e3424 vfs: Add BUG_ON f... |
3009 3010 |
BUG_ON(buffer_delay(bh)); BUG_ON(buffer_unwritten(bh)); |
1da177e4c Linux-2.6.12-rc2 |
3011 |
|
48fd4f93a block: submit_bh(... |
3012 |
/* |
48fd4f93a block: submit_bh(... |
3013 |
* Only clear out a write error when rewriting |
1da177e4c Linux-2.6.12-rc2 |
3014 |
*/ |
2a222ca99 fs: have submit_b... |
3015 |
if (test_set_buffer_req(bh) && (op == REQ_OP_WRITE)) |
1da177e4c Linux-2.6.12-rc2 |
3016 3017 3018 3019 3020 3021 3022 |
clear_buffer_write_io_error(bh); /* * from here on down, it's all bio -- do the initial mapping, * submit_bio -> generic_make_request may further map this bio around */ bio = bio_alloc(GFP_NOIO, 1); |
2a8149081 writeback: implem... |
3023 |
if (wbc) { |
b16b1deb5 writeback: make w... |
3024 |
wbc_init_bio(wbc, bio); |
2a8149081 writeback: implem... |
3025 3026 |
wbc_account_io(wbc, bh->b_page, bh->b_size); } |
bafc0dba1 buffer, writeback... |
3027 |
|
4f024f379 block: Abstract o... |
3028 |
bio->bi_iter.bi_sector = bh->b_blocknr * (bh->b_size >> 9); |
1da177e4c Linux-2.6.12-rc2 |
3029 |
bio->bi_bdev = bh->b_bdev; |
1da177e4c Linux-2.6.12-rc2 |
3030 |
|
6cf66b4ca fs: use helper bi... |
3031 3032 |
bio_add_page(bio, bh->b_page, bh->b_size, bh_offset(bh)); BUG_ON(bio->bi_iter.bi_size != bh->b_size); |
1da177e4c Linux-2.6.12-rc2 |
3033 3034 3035 |
bio->bi_end_io = end_bio_bh_io_sync; bio->bi_private = bh; |
713685111 mm: make snapshot... |
3036 |
bio->bi_flags |= bio_flags; |
1da177e4c Linux-2.6.12-rc2 |
3037 |
|
57302e0dd vfs: avoid "attem... |
3038 |
/* Take care of bh's that straddle the end of the device */ |
2a222ca99 fs: have submit_b... |
3039 |
guard_bio_eod(op, bio); |
57302e0dd vfs: avoid "attem... |
3040 |
|
877f962c5 buffer: add BH_Pr... |
3041 |
if (buffer_meta(bh)) |
2a222ca99 fs: have submit_b... |
3042 |
op_flags |= REQ_META; |
877f962c5 buffer: add BH_Pr... |
3043 |
if (buffer_prio(bh)) |
2a222ca99 fs: have submit_b... |
3044 3045 |
op_flags |= REQ_PRIO; bio_set_op_attrs(bio, op, op_flags); |
877f962c5 buffer: add BH_Pr... |
3046 |
|
4e49ea4a3 block/fs/drivers:... |
3047 |
submit_bio(bio); |
f6454b049 block: fix return... |
3048 |
return 0; |
1da177e4c Linux-2.6.12-rc2 |
3049 |
} |
bafc0dba1 buffer, writeback... |
3050 |
|
2a222ca99 fs: have submit_b... |
3051 3052 |
int _submit_bh(int op, int op_flags, struct buffer_head *bh, unsigned long bio_flags) |
bafc0dba1 buffer, writeback... |
3053 |
{ |
2a222ca99 fs: have submit_b... |
3054 |
return submit_bh_wbc(op, op_flags, bh, bio_flags, NULL); |
bafc0dba1 buffer, writeback... |
3055 |
} |
713685111 mm: make snapshot... |
3056 |
EXPORT_SYMBOL_GPL(_submit_bh); |
2a222ca99 fs: have submit_b... |
3057 |
int submit_bh(int op, int op_flags, struct buffer_head *bh) |
713685111 mm: make snapshot... |
3058 |
{ |
2a222ca99 fs: have submit_b... |
3059 |
return submit_bh_wbc(op, op_flags, bh, 0, NULL); |
713685111 mm: make snapshot... |
3060 |
} |
1fe72eaa0 fs/buffer.c: clea... |
3061 |
EXPORT_SYMBOL(submit_bh); |
1da177e4c Linux-2.6.12-rc2 |
3062 3063 3064 |
/** * ll_rw_block: low-level access to block devices (DEPRECATED) |
dfec8a14f fs: have ll_rw_bl... |
3065 |
* @op: whether to %READ or %WRITE |
70246286e block: get rid of... |
3066 |
* @op_flags: rq_flag_bits |
1da177e4c Linux-2.6.12-rc2 |
3067 3068 3069 |
* @nr: number of &struct buffer_heads in the array * @bhs: array of pointers to &struct buffer_head * |
a76622362 [PATCH] Make ll_r... |
3070 |
* ll_rw_block() takes an array of pointers to &struct buffer_heads, and |
70246286e block: get rid of... |
3071 3072 3073 |
* requests an I/O operation on them, either a %REQ_OP_READ or a %REQ_OP_WRITE. * @op_flags contains flags modifying the detailed I/O behavior, most notably * %REQ_RAHEAD. |
1da177e4c Linux-2.6.12-rc2 |
3074 3075 |
* * This function drops any buffer that it cannot get a lock on (with the |
9cb569d60 remove SWRITE* I/... |
3076 3077 3078 3079 3080 |
* BH_Lock state bit), any buffer that appears to be clean when doing a write * request, and any buffer that appears to be up-to-date when doing read * request. Further it marks as clean buffers that are processed for * writing (the buffer cache won't assume that they are actually clean * until the buffer gets unlocked). |
1da177e4c Linux-2.6.12-rc2 |
3081 3082 |
* * ll_rw_block sets b_end_io to simple completion handler that marks |
e227867f1 treewide: Fix typ... |
3083 |
* the buffer up-to-date (if appropriate), unlocks the buffer and wakes |
1da177e4c Linux-2.6.12-rc2 |
3084 3085 3086 3087 3088 |
* any waiters. * * All of the buffers must be for the same device, and must also be a * multiple of the current approved size for the device. */ |
dfec8a14f fs: have ll_rw_bl... |
3089 |
void ll_rw_block(int op, int op_flags, int nr, struct buffer_head *bhs[]) |
1da177e4c Linux-2.6.12-rc2 |
3090 3091 3092 3093 3094 |
{ int i; for (i = 0; i < nr; i++) { struct buffer_head *bh = bhs[i]; |
9cb569d60 remove SWRITE* I/... |
3095 |
if (!trylock_buffer(bh)) |
1da177e4c Linux-2.6.12-rc2 |
3096 |
continue; |
dfec8a14f fs: have ll_rw_bl... |
3097 |
if (op == WRITE) { |
1da177e4c Linux-2.6.12-rc2 |
3098 |
if (test_clear_buffer_dirty(bh)) { |
76c3073a8 [PATCH] end_buffe... |
3099 |
bh->b_end_io = end_buffer_write_sync; |
e60e5c50a [PATCH] Trivial o... |
3100 |
get_bh(bh); |
dfec8a14f fs: have ll_rw_bl... |
3101 |
submit_bh(op, op_flags, bh); |
1da177e4c Linux-2.6.12-rc2 |
3102 3103 3104 |
continue; } } else { |
1da177e4c Linux-2.6.12-rc2 |
3105 |
if (!buffer_uptodate(bh)) { |
76c3073a8 [PATCH] end_buffe... |
3106 |
bh->b_end_io = end_buffer_read_sync; |
e60e5c50a [PATCH] Trivial o... |
3107 |
get_bh(bh); |
dfec8a14f fs: have ll_rw_bl... |
3108 |
submit_bh(op, op_flags, bh); |
1da177e4c Linux-2.6.12-rc2 |
3109 3110 3111 3112 |
continue; } } unlock_buffer(bh); |
1da177e4c Linux-2.6.12-rc2 |
3113 3114 |
} } |
1fe72eaa0 fs/buffer.c: clea... |
3115 |
EXPORT_SYMBOL(ll_rw_block); |
1da177e4c Linux-2.6.12-rc2 |
3116 |
|
2a222ca99 fs: have submit_b... |
3117 |
void write_dirty_buffer(struct buffer_head *bh, int op_flags) |
9cb569d60 remove SWRITE* I/... |
3118 3119 3120 3121 3122 3123 3124 3125 |
{ lock_buffer(bh); if (!test_clear_buffer_dirty(bh)) { unlock_buffer(bh); return; } bh->b_end_io = end_buffer_write_sync; get_bh(bh); |
2a222ca99 fs: have submit_b... |
3126 |
submit_bh(REQ_OP_WRITE, op_flags, bh); |
9cb569d60 remove SWRITE* I/... |
3127 3128 |
} EXPORT_SYMBOL(write_dirty_buffer); |
1da177e4c Linux-2.6.12-rc2 |
3129 3130 3131 3132 3133 |
/* * For a data-integrity writeout, we need to wait upon any in-progress I/O * and then start new I/O and then wait upon it. The caller must have a ref on * the buffer_head. */ |
2a222ca99 fs: have submit_b... |
3134 |
int __sync_dirty_buffer(struct buffer_head *bh, int op_flags) |
1da177e4c Linux-2.6.12-rc2 |
3135 3136 3137 3138 3139 3140 3141 3142 |
{ int ret = 0; WARN_ON(atomic_read(&bh->b_count) < 1); lock_buffer(bh); if (test_clear_buffer_dirty(bh)) { get_bh(bh); bh->b_end_io = end_buffer_write_sync; |
2a222ca99 fs: have submit_b... |
3143 |
ret = submit_bh(REQ_OP_WRITE, op_flags, bh); |
1da177e4c Linux-2.6.12-rc2 |
3144 |
wait_on_buffer(bh); |
1da177e4c Linux-2.6.12-rc2 |
3145 3146 3147 3148 3149 3150 3151 |
if (!ret && !buffer_uptodate(bh)) ret = -EIO; } else { unlock_buffer(bh); } return ret; } |
87e99511e kill BH_Ordered flag |
3152 3153 3154 3155 3156 3157 |
EXPORT_SYMBOL(__sync_dirty_buffer); int sync_dirty_buffer(struct buffer_head *bh) { return __sync_dirty_buffer(bh, WRITE_SYNC); } |
1fe72eaa0 fs/buffer.c: clea... |
3158 |
EXPORT_SYMBOL(sync_dirty_buffer); |
1da177e4c Linux-2.6.12-rc2 |
3159 3160 3161 3162 3163 3164 3165 3166 3167 3168 3169 3170 3171 3172 3173 3174 3175 3176 3177 3178 3179 3180 3181 3182 3183 3184 3185 3186 3187 3188 3189 3190 3191 3192 3193 |
/* * try_to_free_buffers() checks if all the buffers on this particular page * are unused, and releases them if so. * * Exclusion against try_to_free_buffers may be obtained by either * locking the page or by holding its mapping's private_lock. * * If the page is dirty but all the buffers are clean then we need to * be sure to mark the page clean as well. This is because the page * may be against a block device, and a later reattachment of buffers * to a dirty page will set *all* buffers dirty. Which would corrupt * filesystem data on the same device. * * The same applies to regular filesystem pages: if all the buffers are * clean then we set the page clean and proceed. To do that, we require * total exclusion from __set_page_dirty_buffers(). That is obtained with * private_lock. * * try_to_free_buffers() is non-blocking. */ static inline int buffer_busy(struct buffer_head *bh) { return atomic_read(&bh->b_count) | (bh->b_state & ((1 << BH_Dirty) | (1 << BH_Lock))); } static int drop_buffers(struct page *page, struct buffer_head **buffers_to_free) { struct buffer_head *head = page_buffers(page); struct buffer_head *bh; bh = head; do { |
de7d5a3b6 [PATCH] drop_buff... |
3194 |
if (buffer_write_io_error(bh) && page->mapping) |
5114a97a8 fs: use mapping_s... |
3195 |
mapping_set_error(page->mapping, -EIO); |
1da177e4c Linux-2.6.12-rc2 |
3196 3197 3198 3199 3200 3201 3202 |
if (buffer_busy(bh)) goto failed; bh = bh->b_this_page; } while (bh != head); do { struct buffer_head *next = bh->b_this_page; |
535ee2fbf buffer_head: fix ... |
3203 |
if (bh->b_assoc_map) |
1da177e4c Linux-2.6.12-rc2 |
3204 3205 3206 3207 3208 3209 3210 3211 3212 3213 3214 3215 3216 3217 3218 3219 3220 |
__remove_assoc_queue(bh); bh = next; } while (bh != head); *buffers_to_free = head; __clear_page_buffers(page); return 1; failed: return 0; } int try_to_free_buffers(struct page *page) { struct address_space * const mapping = page->mapping; struct buffer_head *buffers_to_free = NULL; int ret = 0; BUG_ON(!PageLocked(page)); |
ecdfc9787 Resurrect 'try_to... |
3221 |
if (PageWriteback(page)) |
1da177e4c Linux-2.6.12-rc2 |
3222 3223 3224 3225 3226 3227 3228 3229 3230 |
return 0; if (mapping == NULL) { /* can this still happen? */ ret = drop_buffers(page, &buffers_to_free); goto out; } spin_lock(&mapping->private_lock); ret = drop_buffers(page, &buffers_to_free); |
ecdfc9787 Resurrect 'try_to... |
3231 3232 3233 3234 3235 3236 3237 3238 3239 3240 |
/* * If the filesystem writes its buffers by hand (eg ext3) * then we can have clean buffers against a dirty page. We * clean the page here; otherwise the VM will never notice * that the filesystem did any IO at all. * * Also, during truncate, discard_buffer will have marked all * the page's buffers clean. We discover that here and clean * the page also. |
87df7241b [PATCH] Fix try_t... |
3241 3242 3243 3244 |
* * private_lock must be held over this entire operation in order * to synchronise against __set_page_dirty_buffers and prevent the * dirty bit from being lost. |
ecdfc9787 Resurrect 'try_to... |
3245 |
*/ |
11f81becc page_writeback: r... |
3246 3247 |
if (ret) cancel_dirty_page(page); |
87df7241b [PATCH] Fix try_t... |
3248 |
spin_unlock(&mapping->private_lock); |
1da177e4c Linux-2.6.12-rc2 |
3249 3250 3251 3252 3253 3254 3255 3256 3257 3258 3259 3260 3261 |
out: if (buffers_to_free) { struct buffer_head *bh = buffers_to_free; do { struct buffer_head *next = bh->b_this_page; free_buffer_head(bh); bh = next; } while (bh != buffers_to_free); } return ret; } EXPORT_SYMBOL(try_to_free_buffers); |
1da177e4c Linux-2.6.12-rc2 |
3262 3263 3264 3265 3266 |
/* * There are no bdflush tunables left. But distributions are * still running obsolete flush daemons, so we terminate them here. * * Use of bdflush() is deprecated and will be removed in a future kernel. |
5b0830cb9 writeback: get ri... |
3267 |
* The `flush-X' kernel threads fully replace bdflush daemons and this call. |
1da177e4c Linux-2.6.12-rc2 |
3268 |
*/ |
bdc480e3b [CVE-2009-0029] S... |
3269 |
SYSCALL_DEFINE2(bdflush, int, func, long, data) |
1da177e4c Linux-2.6.12-rc2 |
3270 3271 3272 3273 3274 3275 3276 3277 3278 3279 3280 3281 3282 3283 3284 3285 3286 3287 3288 3289 3290 3291 3292 3293 |
{ static int msg_count; if (!capable(CAP_SYS_ADMIN)) return -EPERM; if (msg_count < 5) { msg_count++; printk(KERN_INFO "warning: process `%s' used the obsolete bdflush" " system call ", current->comm); printk(KERN_INFO "Fix your initscripts? "); } if (func == 1) do_exit(0); return 0; } /* * Buffer-head allocation */ |
a0a9b0433 fs: Move bh_cache... |
3294 |
static struct kmem_cache *bh_cachep __read_mostly; |
1da177e4c Linux-2.6.12-rc2 |
3295 3296 3297 3298 3299 |
/* * Once the number of bh's in the machine exceeds this level, we start * stripping them in writeback. */ |
43be594a6 fs/buffer.c: chan... |
3300 |
static unsigned long max_buffer_heads; |
1da177e4c Linux-2.6.12-rc2 |
3301 3302 3303 3304 3305 3306 3307 3308 3309 3310 3311 3312 3313 3314 |
int buffer_heads_over_limit; struct bh_accounting { int nr; /* Number of live bh's */ int ratelimit; /* Limit cacheline bouncing */ }; static DEFINE_PER_CPU(struct bh_accounting, bh_accounting) = {0, 0}; static void recalc_bh_state(void) { int i; int tot = 0; |
ee1be8626 fs: Use this_cpu_... |
3315 |
if (__this_cpu_inc_return(bh_accounting.ratelimit) - 1 < 4096) |
1da177e4c Linux-2.6.12-rc2 |
3316 |
return; |
c7b92516a fs: Use this_cpu_... |
3317 |
__this_cpu_write(bh_accounting.ratelimit, 0); |
8a1434268 [PATCH] HOTPLUG_C... |
3318 |
for_each_online_cpu(i) |
1da177e4c Linux-2.6.12-rc2 |
3319 3320 3321 |
tot += per_cpu(bh_accounting, i).nr; buffer_heads_over_limit = (tot > max_buffer_heads); } |
c7b92516a fs: Use this_cpu_... |
3322 |
|
dd0fc66fb [PATCH] gfp flags... |
3323 |
struct buffer_head *alloc_buffer_head(gfp_t gfp_flags) |
1da177e4c Linux-2.6.12-rc2 |
3324 |
{ |
019b4d123 fs: buffer_head: ... |
3325 |
struct buffer_head *ret = kmem_cache_zalloc(bh_cachep, gfp_flags); |
1da177e4c Linux-2.6.12-rc2 |
3326 |
if (ret) { |
a35afb830 Remove SLAB_CTOR_... |
3327 |
INIT_LIST_HEAD(&ret->b_assoc_buffers); |
c7b92516a fs: Use this_cpu_... |
3328 3329 |
preempt_disable(); __this_cpu_inc(bh_accounting.nr); |
1da177e4c Linux-2.6.12-rc2 |
3330 |
recalc_bh_state(); |
c7b92516a fs: Use this_cpu_... |
3331 |
preempt_enable(); |
1da177e4c Linux-2.6.12-rc2 |
3332 3333 3334 3335 3336 3337 3338 3339 3340 |
} return ret; } EXPORT_SYMBOL(alloc_buffer_head); void free_buffer_head(struct buffer_head *bh) { BUG_ON(!list_empty(&bh->b_assoc_buffers)); kmem_cache_free(bh_cachep, bh); |
c7b92516a fs: Use this_cpu_... |
3341 3342 |
preempt_disable(); __this_cpu_dec(bh_accounting.nr); |
1da177e4c Linux-2.6.12-rc2 |
3343 |
recalc_bh_state(); |
c7b92516a fs: Use this_cpu_... |
3344 |
preempt_enable(); |
1da177e4c Linux-2.6.12-rc2 |
3345 3346 |
} EXPORT_SYMBOL(free_buffer_head); |
1da177e4c Linux-2.6.12-rc2 |
3347 3348 3349 3350 3351 3352 3353 3354 3355 |
static void buffer_exit_cpu(int cpu) { int i; struct bh_lru *b = &per_cpu(bh_lrus, cpu); for (i = 0; i < BH_LRU_SIZE; i++) { brelse(b->bhs[i]); b->bhs[i] = NULL; } |
c7b92516a fs: Use this_cpu_... |
3356 |
this_cpu_add(bh_accounting.nr, per_cpu(bh_accounting, cpu).nr); |
8a1434268 [PATCH] HOTPLUG_C... |
3357 |
per_cpu(bh_accounting, cpu).nr = 0; |
1da177e4c Linux-2.6.12-rc2 |
3358 3359 3360 3361 3362 |
} static int buffer_cpu_notify(struct notifier_block *self, unsigned long action, void *hcpu) { |
8bb784428 Add suspend-relat... |
3363 |
if (action == CPU_DEAD || action == CPU_DEAD_FROZEN) |
1da177e4c Linux-2.6.12-rc2 |
3364 3365 3366 |
buffer_exit_cpu((unsigned long)hcpu); return NOTIFY_OK; } |
1da177e4c Linux-2.6.12-rc2 |
3367 |
|
389d1b083 Add buffer head r... |
3368 |
/** |
a6b91919e fs: fix kernel-do... |
3369 |
* bh_uptodate_or_lock - Test whether the buffer is uptodate |
389d1b083 Add buffer head r... |
3370 3371 3372 3373 3374 3375 3376 3377 3378 3379 3380 3381 3382 3383 3384 3385 3386 3387 |
* @bh: struct buffer_head * * Return true if the buffer is up-to-date and false, * with the buffer locked, if not. */ int bh_uptodate_or_lock(struct buffer_head *bh) { if (!buffer_uptodate(bh)) { lock_buffer(bh); if (!buffer_uptodate(bh)) return 0; unlock_buffer(bh); } return 1; } EXPORT_SYMBOL(bh_uptodate_or_lock); /** |
a6b91919e fs: fix kernel-do... |
3388 |
* bh_submit_read - Submit a locked buffer for reading |
389d1b083 Add buffer head r... |
3389 3390 3391 3392 3393 3394 3395 3396 3397 3398 3399 3400 3401 3402 3403 |
* @bh: struct buffer_head * * Returns zero on success and -EIO on error. */ int bh_submit_read(struct buffer_head *bh) { BUG_ON(!buffer_locked(bh)); if (buffer_uptodate(bh)) { unlock_buffer(bh); return 0; } get_bh(bh); bh->b_end_io = end_buffer_read_sync; |
2a222ca99 fs: have submit_b... |
3404 |
submit_bh(REQ_OP_READ, 0, bh); |
389d1b083 Add buffer head r... |
3405 3406 3407 3408 3409 3410 |
wait_on_buffer(bh); if (buffer_uptodate(bh)) return 0; return -EIO; } EXPORT_SYMBOL(bh_submit_read); |
1da177e4c Linux-2.6.12-rc2 |
3411 3412 |
void __init buffer_init(void) { |
43be594a6 fs/buffer.c: chan... |
3413 |
unsigned long nrpages; |
1da177e4c Linux-2.6.12-rc2 |
3414 |
|
b98938c37 bufferhead: rever... |
3415 3416 3417 3418 |
bh_cachep = kmem_cache_create("buffer_head", sizeof(struct buffer_head), 0, (SLAB_RECLAIM_ACCOUNT|SLAB_PANIC| SLAB_MEM_SPREAD), |
019b4d123 fs: buffer_head: ... |
3419 |
NULL); |
1da177e4c Linux-2.6.12-rc2 |
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/* * Limit the bh occupancy to 10% of ZONE_NORMAL */ nrpages = (nr_free_buffer_pages() * 10) / 100; max_buffer_heads = nrpages * (PAGE_SIZE / sizeof(struct buffer_head)); hotcpu_notifier(buffer_cpu_notify, 0); } |