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fs/gfs2/bmap.c
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/* * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. |
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* Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved. |
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* * This copyrighted material is made available to anyone wishing to use, * modify, copy, or redistribute it subject to the terms and conditions |
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* of the GNU General Public License version 2. |
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*/ |
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#include <linux/spinlock.h> #include <linux/completion.h> #include <linux/buffer_head.h> |
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#include <linux/gfs2_ondisk.h> |
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#include <linux/crc32.h> |
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#include "gfs2.h" |
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#include "incore.h" |
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#include "bmap.h" #include "glock.h" #include "inode.h" |
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#include "meta_io.h" |
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#include "quota.h" #include "rgrp.h" #include "trans.h" |
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#include "dir.h" |
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#include "util.h" |
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#include "trace_gfs2.h" |
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/* This doesn't need to be that large as max 64 bit pointers in a 4k * block is 512, so __u16 is fine for that. It saves stack space to * keep it small. */ struct metapath { |
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struct buffer_head *mp_bh[GFS2_MAX_META_HEIGHT]; |
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__u16 mp_list[GFS2_MAX_META_HEIGHT]; }; typedef int (*block_call_t) (struct gfs2_inode *ip, struct buffer_head *dibh, |
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struct buffer_head *bh, __be64 *top, __be64 *bottom, unsigned int height, |
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void *data); struct strip_mine { int sm_first; unsigned int sm_height; }; /** |
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* gfs2_unstuffer_page - unstuff a stuffed inode into a block cached by a page * @ip: the inode * @dibh: the dinode buffer * @block: the block number that was allocated * @private: any locked page held by the caller process * * Returns: errno */ static int gfs2_unstuffer_page(struct gfs2_inode *ip, struct buffer_head *dibh, |
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u64 block, struct page *page) |
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{ |
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struct inode *inode = &ip->i_inode; struct buffer_head *bh; int release = 0; if (!page || page->index) { page = grab_cache_page(inode->i_mapping, 0); if (!page) return -ENOMEM; release = 1; } if (!PageUptodate(page)) { void *kaddr = kmap(page); |
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u64 dsize = i_size_read(inode); if (dsize > (dibh->b_size - sizeof(struct gfs2_dinode))) dsize = dibh->b_size - sizeof(struct gfs2_dinode); |
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|
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memcpy(kaddr, dibh->b_data + sizeof(struct gfs2_dinode), dsize); memset(kaddr + dsize, 0, PAGE_CACHE_SIZE - dsize); |
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kunmap(page); SetPageUptodate(page); } if (!page_has_buffers(page)) create_empty_buffers(page, 1 << inode->i_blkbits, (1 << BH_Uptodate)); bh = page_buffers(page); if (!buffer_mapped(bh)) map_bh(bh, inode->i_sb, block); set_buffer_uptodate(bh); |
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if (!gfs2_is_jdata(ip)) mark_buffer_dirty(bh); |
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if (!gfs2_is_writeback(ip)) |
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gfs2_trans_add_bh(ip->i_gl, bh, 0); |
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if (release) { unlock_page(page); page_cache_release(page); } return 0; } /** |
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* gfs2_unstuff_dinode - Unstuff a dinode when the data has grown too big * @ip: The GFS2 inode to unstuff * @unstuffer: the routine that handles unstuffing a non-zero length file * @private: private data for the unstuffer * * This routine unstuffs a dinode and returns it to a "normal" state such * that the height can be grown in the traditional way. * * Returns: errno */ |
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int gfs2_unstuff_dinode(struct gfs2_inode *ip, struct page *page) |
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{ struct buffer_head *bh, *dibh; |
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struct gfs2_dinode *di; |
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u64 block = 0; |
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int isdir = gfs2_is_dir(ip); |
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int error; down_write(&ip->i_rw_mutex); error = gfs2_meta_inode_buffer(ip, &dibh); if (error) goto out; |
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|
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if (ip->i_disksize) { |
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/* Get a free block, fill it with the stuffed data, and write it out to disk */ |
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unsigned int n = 1; |
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error = gfs2_alloc_block(ip, &block, &n); if (error) goto out_brelse; |
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if (isdir) { |
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gfs2_trans_add_unrevoke(GFS2_SB(&ip->i_inode), block, 1); |
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error = gfs2_dir_get_new_buffer(ip, block, &bh); |
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if (error) goto out_brelse; |
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gfs2_buffer_copy_tail(bh, sizeof(struct gfs2_meta_header), |
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dibh, sizeof(struct gfs2_dinode)); brelse(bh); } else { |
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error = gfs2_unstuffer_page(ip, dibh, block, page); |
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if (error) goto out_brelse; } } /* Set up the pointer to the new block */ |
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gfs2_trans_add_bh(ip->i_gl, dibh, 1); |
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di = (struct gfs2_dinode *)dibh->b_data; |
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gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode)); |
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if (ip->i_disksize) { |
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*(__be64 *)(di + 1) = cpu_to_be64(block); |
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gfs2_add_inode_blocks(&ip->i_inode, 1); di->di_blocks = cpu_to_be64(gfs2_get_inode_blocks(&ip->i_inode)); |
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} |
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ip->i_height = 1; |
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di->di_height = cpu_to_be16(1); |
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out_brelse: |
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brelse(dibh); |
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out: |
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up_write(&ip->i_rw_mutex); |
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return error; } |
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/** * find_metapath - Find path through the metadata tree |
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* @sdp: The superblock |
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* @mp: The metapath to return the result in * @block: The disk block to look up |
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* @height: The pre-calculated height of the metadata tree |
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* * This routine returns a struct metapath structure that defines a path * through the metadata of inode "ip" to get to block "block". * * Example: * Given: "ip" is a height 3 file, "offset" is 101342453, and this is a * filesystem with a blocksize of 4096. * * find_metapath() would return a struct metapath structure set to: * mp_offset = 101342453, mp_height = 3, mp_list[0] = 0, mp_list[1] = 48, * and mp_list[2] = 165. * * That means that in order to get to the block containing the byte at * offset 101342453, we would load the indirect block pointed to by pointer * 0 in the dinode. We would then load the indirect block pointed to by * pointer 48 in that indirect block. We would then load the data block * pointed to by pointer 165 in that indirect block. * * ---------------------------------------- * | Dinode | | * | | 4| * | |0 1 2 3 4 5 9| * | | 6| * ---------------------------------------- * | * | * V * ---------------------------------------- * | Indirect Block | * | 5| * | 4 4 4 4 4 5 5 1| * |0 5 6 7 8 9 0 1 2| * ---------------------------------------- * | * | * V * ---------------------------------------- * | Indirect Block | * | 1 1 1 1 1 5| * | 6 6 6 6 6 1| * |0 3 4 5 6 7 2| * ---------------------------------------- * | * | * V * ---------------------------------------- * | Data block containing offset | * | 101342453 | * | | * | | * ---------------------------------------- * */ |
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static void find_metapath(const struct gfs2_sbd *sdp, u64 block, struct metapath *mp, unsigned int height) |
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{ |
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unsigned int i; |
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for (i = height; i--;) |
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mp->mp_list[i] = do_div(block, sdp->sd_inptrs); |
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} |
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static inline unsigned int metapath_branch_start(const struct metapath *mp) |
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{ |
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if (mp->mp_list[0] == 0) return 2; return 1; |
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} |
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/** * metapointer - Return pointer to start of metadata in a buffer |
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* @height: The metadata height (0 = dinode) * @mp: The metapath * * Return a pointer to the block number of the next height of the metadata * tree given a buffer containing the pointer to the current height of the * metadata tree. */ |
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static inline __be64 *metapointer(unsigned int height, const struct metapath *mp) |
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{ |
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struct buffer_head *bh = mp->mp_bh[height]; |
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unsigned int head_size = (height > 0) ? sizeof(struct gfs2_meta_header) : sizeof(struct gfs2_dinode); |
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return ((__be64 *)(bh->b_data + head_size)) + mp->mp_list[height]; |
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} /** |
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* lookup_metapath - Walk the metadata tree to a specific point * @ip: The inode |
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* @mp: The metapath |
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* |
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* Assumes that the inode's buffer has already been looked up and * hooked onto mp->mp_bh[0] and that the metapath has been initialised * by find_metapath(). * * If this function encounters part of the tree which has not been * allocated, it returns the current height of the tree at the point * at which it found the unallocated block. Blocks which are found are * added to the mp->mp_bh[] list. |
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* |
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* Returns: error or height of metadata tree |
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*/ |
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static int lookup_metapath(struct gfs2_inode *ip, struct metapath *mp) |
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{ |
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unsigned int end_of_metadata = ip->i_height - 1; unsigned int x; |
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__be64 *ptr; u64 dblock; |
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int ret; |
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for (x = 0; x < end_of_metadata; x++) { |
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ptr = metapointer(x, mp); dblock = be64_to_cpu(*ptr); if (!dblock) return x + 1; |
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|
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ret = gfs2_meta_indirect_buffer(ip, x+1, dblock, 0, &mp->mp_bh[x+1]); |
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if (ret) return ret; } |
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return ip->i_height; |
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} |
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static inline void release_metapath(struct metapath *mp) |
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{ int i; |
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for (i = 0; i < GFS2_MAX_META_HEIGHT; i++) { if (mp->mp_bh[i] == NULL) break; brelse(mp->mp_bh[i]); } |
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} |
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/** * gfs2_extent_length - Returns length of an extent of blocks * @start: Start of the buffer * @len: Length of the buffer in bytes * @ptr: Current position in the buffer * @limit: Max extent length to return (0 = unlimited) * @eob: Set to 1 if we hit "end of block" * * If the first block is zero (unallocated) it will return the number of * unallocated blocks in the extent, otherwise it will return the number * of contiguous blocks in the extent. * * Returns: The length of the extent (minimum of one block) */ static inline unsigned int gfs2_extent_length(void *start, unsigned int len, __be64 *ptr, unsigned limit, int *eob) { const __be64 *end = (start + len); const __be64 *first = ptr; u64 d = be64_to_cpu(*ptr); *eob = 0; do { ptr++; if (ptr >= end) break; if (limit && --limit == 0) break; if (d) d++; } while(be64_to_cpu(*ptr) == d); if (ptr >= end) *eob = 1; return (ptr - first); } |
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static inline void bmap_lock(struct gfs2_inode *ip, int create) |
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{ |
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if (create) down_write(&ip->i_rw_mutex); else down_read(&ip->i_rw_mutex); } |
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static inline void bmap_unlock(struct gfs2_inode *ip, int create) |
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{ |
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if (create) up_write(&ip->i_rw_mutex); else up_read(&ip->i_rw_mutex); } |
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static inline __be64 *gfs2_indirect_init(struct metapath *mp, struct gfs2_glock *gl, unsigned int i, unsigned offset, u64 bn) { __be64 *ptr = (__be64 *)(mp->mp_bh[i - 1]->b_data + ((i > 1) ? sizeof(struct gfs2_meta_header) : sizeof(struct gfs2_dinode))); BUG_ON(i < 1); BUG_ON(mp->mp_bh[i] != NULL); mp->mp_bh[i] = gfs2_meta_new(gl, bn); gfs2_trans_add_bh(gl, mp->mp_bh[i], 1); gfs2_metatype_set(mp->mp_bh[i], GFS2_METATYPE_IN, GFS2_FORMAT_IN); gfs2_buffer_clear_tail(mp->mp_bh[i], sizeof(struct gfs2_meta_header)); ptr += offset; *ptr = cpu_to_be64(bn); return ptr; } enum alloc_state { ALLOC_DATA = 0, ALLOC_GROW_DEPTH = 1, ALLOC_GROW_HEIGHT = 2, /* ALLOC_UNSTUFF = 3, TBD and rather complicated */ }; /** * gfs2_bmap_alloc - Build a metadata tree of the requested height * @inode: The GFS2 inode * @lblock: The logical starting block of the extent * @bh_map: This is used to return the mapping details * @mp: The metapath * @sheight: The starting height (i.e. whats already mapped) * @height: The height to build to * @maxlen: The max number of data blocks to alloc * * In this routine we may have to alloc: * i) Indirect blocks to grow the metadata tree height * ii) Indirect blocks to fill in lower part of the metadata tree * iii) Data blocks * * The function is in two parts. The first part works out the total * number of blocks which we need. The second part does the actual * allocation asking for an extent at a time (if enough contiguous free * blocks are available, there will only be one request per bmap call) * and uses the state machine to initialise the blocks in order. * * Returns: errno on error */ static int gfs2_bmap_alloc(struct inode *inode, const sector_t lblock, struct buffer_head *bh_map, struct metapath *mp, const unsigned int sheight, const unsigned int height, const unsigned int maxlen) { struct gfs2_inode *ip = GFS2_I(inode); struct gfs2_sbd *sdp = GFS2_SB(inode); struct buffer_head *dibh = mp->mp_bh[0]; u64 bn, dblock = 0; |
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unsigned n, i, blks, alloced = 0, iblks = 0, branch_start = 0; |
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unsigned dblks = 0; unsigned ptrs_per_blk; const unsigned end_of_metadata = height - 1; int eob = 0; enum alloc_state state; __be64 *ptr; __be64 zero_bn = 0; BUG_ON(sheight < 1); BUG_ON(dibh == NULL); gfs2_trans_add_bh(ip->i_gl, dibh, 1); if (height == sheight) { struct buffer_head *bh; /* Bottom indirect block exists, find unalloced extent size */ ptr = metapointer(end_of_metadata, mp); bh = mp->mp_bh[end_of_metadata]; dblks = gfs2_extent_length(bh->b_data, bh->b_size, ptr, maxlen, &eob); BUG_ON(dblks < 1); state = ALLOC_DATA; } else { /* Need to allocate indirect blocks */ ptrs_per_blk = height > 1 ? sdp->sd_inptrs : sdp->sd_diptrs; dblks = min(maxlen, ptrs_per_blk - mp->mp_list[end_of_metadata]); if (height == ip->i_height) { /* Writing into existing tree, extend tree down */ iblks = height - sheight; state = ALLOC_GROW_DEPTH; } else { /* Building up tree height */ state = ALLOC_GROW_HEIGHT; iblks = height - ip->i_height; |
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branch_start = metapath_branch_start(mp); iblks += (height - branch_start); |
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} } /* start of the second part of the function (state machine) */ blks = dblks + iblks; i = sheight; do { |
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int error; |
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n = blks - alloced; |
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error = gfs2_alloc_block(ip, &bn, &n); if (error) return error; |
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alloced += n; if (state != ALLOC_DATA || gfs2_is_jdata(ip)) gfs2_trans_add_unrevoke(sdp, bn, n); switch (state) { /* Growing height of tree */ case ALLOC_GROW_HEIGHT: if (i == 1) { ptr = (__be64 *)(dibh->b_data + sizeof(struct gfs2_dinode)); zero_bn = *ptr; } for (; i - 1 < height - ip->i_height && n > 0; i++, n--) gfs2_indirect_init(mp, ip->i_gl, i, 0, bn++); if (i - 1 == height - ip->i_height) { i--; gfs2_buffer_copy_tail(mp->mp_bh[i], sizeof(struct gfs2_meta_header), dibh, sizeof(struct gfs2_dinode)); gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode) + sizeof(__be64)); ptr = (__be64 *)(mp->mp_bh[i]->b_data + sizeof(struct gfs2_meta_header)); *ptr = zero_bn; state = ALLOC_GROW_DEPTH; |
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for(i = branch_start; i < height; i++) { |
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493 494 495 496 497 |
if (mp->mp_bh[i] == NULL) break; brelse(mp->mp_bh[i]); mp->mp_bh[i] = NULL; } |
5af4e7a0b [GFS2] fix gfs2 b... |
498 |
i = branch_start; |
9b8c81d1d [GFS2] Allow bmap... |
499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 |
} if (n == 0) break; /* Branching from existing tree */ case ALLOC_GROW_DEPTH: if (i > 1 && i < height) gfs2_trans_add_bh(ip->i_gl, mp->mp_bh[i-1], 1); for (; i < height && n > 0; i++, n--) gfs2_indirect_init(mp, ip->i_gl, i, mp->mp_list[i-1], bn++); if (i == height) state = ALLOC_DATA; if (n == 0) break; /* Tree complete, adding data blocks */ case ALLOC_DATA: BUG_ON(n > dblks); BUG_ON(mp->mp_bh[end_of_metadata] == NULL); gfs2_trans_add_bh(ip->i_gl, mp->mp_bh[end_of_metadata], 1); dblks = n; ptr = metapointer(end_of_metadata, mp); dblock = bn; while (n-- > 0) *ptr++ = cpu_to_be64(bn++); break; } |
07ccb7bf2 GFS2: Fix bmap al... |
525 |
} while ((state != ALLOC_DATA) || !dblock); |
9b8c81d1d [GFS2] Allow bmap... |
526 527 528 529 530 531 532 533 534 |
ip->i_height = height; gfs2_add_inode_blocks(&ip->i_inode, alloced); gfs2_dinode_out(ip, mp->mp_bh[0]->b_data); map_bh(bh_map, inode->i_sb, dblock); bh_map->b_size = dblks << inode->i_blkbits; set_buffer_new(bh_map); return 0; } |
b3b94faa5 [GFS2] The core o... |
535 |
/** |
4cf1ed814 [GFS2] Tidy up bm... |
536 |
* gfs2_block_map - Map a block from an inode to a disk block |
fd88de569 [GFS2] Readpages ... |
537 |
* @inode: The inode |
b3b94faa5 [GFS2] The core o... |
538 |
* @lblock: The logical block number |
4cf1ed814 [GFS2] Tidy up bm... |
539 |
* @bh_map: The bh to be mapped |
9b8c81d1d [GFS2] Allow bmap... |
540 |
* @create: True if its ok to alloc blocks to satify the request |
b3b94faa5 [GFS2] The core o... |
541 |
* |
9b8c81d1d [GFS2] Allow bmap... |
542 543 544 |
* Sets buffer_mapped() if successful, sets buffer_boundary() if a * read of metadata will be required before the next block can be * mapped. Sets buffer_new() if new blocks were allocated. |
b3b94faa5 [GFS2] The core o... |
545 546 547 |
* * Returns: errno */ |
e9e1ef2b6 [GFS2] Remove fun... |
548 549 |
int gfs2_block_map(struct inode *inode, sector_t lblock, struct buffer_head *bh_map, int create) |
b3b94faa5 [GFS2] The core o... |
550 |
{ |
feaa7bba0 [GFS2] Fix unlink... |
551 552 |
struct gfs2_inode *ip = GFS2_I(inode); struct gfs2_sbd *sdp = GFS2_SB(inode); |
ecc30c791 [GFS2] Streamline... |
553 |
unsigned int bsize = sdp->sd_sb.sb_bsize; |
9b8c81d1d [GFS2] Allow bmap... |
554 |
const unsigned int maxlen = bh_map->b_size >> inode->i_blkbits; |
ecc30c791 [GFS2] Streamline... |
555 |
const u64 *arr = sdp->sd_heightsize; |
9b8c81d1d [GFS2] Allow bmap... |
556 557 558 559 560 561 562 563 |
__be64 *ptr; u64 size; struct metapath mp; int ret; int eob; unsigned int len; struct buffer_head *bh; u8 height; |
7276b3b0c [GFS2] Tidy up me... |
564 |
|
9b8c81d1d [GFS2] Allow bmap... |
565 |
BUG_ON(maxlen == 0); |
b3b94faa5 [GFS2] The core o... |
566 |
|
dbac6710a [GFS2] Introduce ... |
567 |
memset(mp.mp_bh, 0, sizeof(mp.mp_bh)); |
9b8c81d1d [GFS2] Allow bmap... |
568 |
bmap_lock(ip, create); |
4cf1ed814 [GFS2] Tidy up bm... |
569 570 571 |
clear_buffer_mapped(bh_map); clear_buffer_new(bh_map); clear_buffer_boundary(bh_map); |
63997775b GFS2: Add tracepo... |
572 |
trace_gfs2_bmap(ip, bh_map, lblock, create, 1); |
ecc30c791 [GFS2] Streamline... |
573 574 575 576 |
if (gfs2_is_dir(ip)) { bsize = sdp->sd_jbsize; arr = sdp->sd_jheightsize; } |
4cf1ed814 [GFS2] Tidy up bm... |
577 |
|
9b8c81d1d [GFS2] Allow bmap... |
578 579 580 |
ret = gfs2_meta_inode_buffer(ip, &mp.mp_bh[0]); if (ret) goto out; |
b3b94faa5 [GFS2] The core o... |
581 |
|
9b8c81d1d [GFS2] Allow bmap... |
582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 |
height = ip->i_height; size = (lblock + 1) * bsize; while (size > arr[height]) height++; find_metapath(sdp, lblock, &mp, height); ret = 1; if (height > ip->i_height || gfs2_is_stuffed(ip)) goto do_alloc; ret = lookup_metapath(ip, &mp); if (ret < 0) goto out; if (ret != ip->i_height) goto do_alloc; ptr = metapointer(ip->i_height - 1, &mp); if (*ptr == 0) goto do_alloc; map_bh(bh_map, inode->i_sb, be64_to_cpu(*ptr)); bh = mp.mp_bh[ip->i_height - 1]; len = gfs2_extent_length(bh->b_data, bh->b_size, ptr, maxlen, &eob); bh_map->b_size = (len << inode->i_blkbits); if (eob) set_buffer_boundary(bh_map); ret = 0; out: release_metapath(&mp); |
63997775b GFS2: Add tracepo... |
607 |
trace_gfs2_bmap(ip, bh_map, lblock, create, ret); |
9b8c81d1d [GFS2] Allow bmap... |
608 609 |
bmap_unlock(ip, create); return ret; |
30cbf189c [GFS2] Add a func... |
610 |
|
9b8c81d1d [GFS2] Allow bmap... |
611 612 613 614 615 616 |
do_alloc: /* All allocations are done here, firstly check create flag */ if (!create) { BUG_ON(gfs2_is_stuffed(ip)); ret = 0; goto out; |
b3b94faa5 [GFS2] The core o... |
617 |
} |
9b8c81d1d [GFS2] Allow bmap... |
618 619 620 621 |
/* At this point ret is the tree depth of already allocated blocks */ ret = gfs2_bmap_alloc(inode, lblock, bh_map, &mp, ret, height, maxlen); goto out; |
fd88de569 [GFS2] Readpages ... |
622 |
} |
941e6d7d0 [GFS2] Speed up g... |
623 624 625 |
/* * Deprecated: do not use in new code */ |
fd88de569 [GFS2] Readpages ... |
626 627 |
int gfs2_extent_map(struct inode *inode, u64 lblock, int *new, u64 *dblock, unsigned *extlen) { |
23591256d [GFS2] Fix bmap t... |
628 |
struct buffer_head bh = { .b_state = 0, .b_blocknr = 0 }; |
7a6bbacbb [GFS2] Map multip... |
629 |
int ret; |
fd88de569 [GFS2] Readpages ... |
630 631 632 633 634 |
int create = *new; BUG_ON(!extlen); BUG_ON(!dblock); BUG_ON(!new); |
9b8c81d1d [GFS2] Allow bmap... |
635 |
bh.b_size = 1 << (inode->i_blkbits + (create ? 0 : 5)); |
e9e1ef2b6 [GFS2] Remove fun... |
636 |
ret = gfs2_block_map(inode, lblock, &bh, create); |
7a6bbacbb [GFS2] Map multip... |
637 638 639 640 641 642 643 |
*extlen = bh.b_size >> inode->i_blkbits; *dblock = bh.b_blocknr; if (buffer_new(&bh)) *new = 1; else *new = 0; return ret; |
b3b94faa5 [GFS2] The core o... |
644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 |
} /** * recursive_scan - recursively scan through the end of a file * @ip: the inode * @dibh: the dinode buffer * @mp: the path through the metadata to the point to start * @height: the height the recursion is at * @block: the indirect block to look at * @first: 1 if this is the first block * @bc: the call to make for each piece of metadata * @data: data opaque to this function to pass to @bc * * When this is first called @height and @block should be zero and * @first should be 1. * * Returns: errno */ static int recursive_scan(struct gfs2_inode *ip, struct buffer_head *dibh, struct metapath *mp, unsigned int height, |
cd915493f [GFS2] Change all... |
665 |
u64 block, int first, block_call_t bc, |
b3b94faa5 [GFS2] The core o... |
666 667 |
void *data) { |
feaa7bba0 [GFS2] Fix unlink... |
668 |
struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); |
b3b94faa5 [GFS2] The core o... |
669 |
struct buffer_head *bh = NULL; |
b44b84d76 [GFS2] gfs2 misc ... |
670 |
__be64 *top, *bottom; |
cd915493f [GFS2] Change all... |
671 |
u64 bn; |
b3b94faa5 [GFS2] The core o... |
672 673 674 675 676 677 678 679 |
int error; int mh_size = sizeof(struct gfs2_meta_header); if (!height) { error = gfs2_meta_inode_buffer(ip, &bh); if (error) return error; dibh = bh; |
b44b84d76 [GFS2] gfs2 misc ... |
680 681 |
top = (__be64 *)(bh->b_data + sizeof(struct gfs2_dinode)) + mp->mp_list[0]; bottom = (__be64 *)(bh->b_data + sizeof(struct gfs2_dinode)) + sdp->sd_diptrs; |
b3b94faa5 [GFS2] The core o... |
682 683 684 685 |
} else { error = gfs2_meta_indirect_buffer(ip, height, block, 0, &bh); if (error) return error; |
b44b84d76 [GFS2] gfs2 misc ... |
686 |
top = (__be64 *)(bh->b_data + mh_size) + |
c53921248 [GFS2] More style... |
687 |
(first ? mp->mp_list[height] : 0); |
b3b94faa5 [GFS2] The core o... |
688 |
|
b44b84d76 [GFS2] gfs2 misc ... |
689 |
bottom = (__be64 *)(bh->b_data + mh_size) + sdp->sd_inptrs; |
b3b94faa5 [GFS2] The core o... |
690 691 692 693 694 |
} error = bc(ip, dibh, bh, top, bottom, height, data); if (error) goto out; |
ecc30c791 [GFS2] Streamline... |
695 |
if (height < ip->i_height - 1) |
b3b94faa5 [GFS2] The core o... |
696 697 698 699 700 701 702 703 704 705 706 |
for (; top < bottom; top++, first = 0) { if (!*top) continue; bn = be64_to_cpu(*top); error = recursive_scan(ip, dibh, mp, height + 1, bn, first, bc, data); if (error) break; } |
a91ea69ff [GFS2] Align all ... |
707 |
out: |
b3b94faa5 [GFS2] The core o... |
708 |
brelse(bh); |
b3b94faa5 [GFS2] The core o... |
709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 |
return error; } /** * do_strip - Look for a layer a particular layer of the file and strip it off * @ip: the inode * @dibh: the dinode buffer * @bh: A buffer of pointers * @top: The first pointer in the buffer * @bottom: One more than the last pointer * @height: the height this buffer is at * @data: a pointer to a struct strip_mine * * Returns: errno */ static int do_strip(struct gfs2_inode *ip, struct buffer_head *dibh, |
b44b84d76 [GFS2] gfs2 misc ... |
726 |
struct buffer_head *bh, __be64 *top, __be64 *bottom, |
b3b94faa5 [GFS2] The core o... |
727 728 |
unsigned int height, void *data) { |
feaa7bba0 [GFS2] Fix unlink... |
729 730 |
struct strip_mine *sm = data; struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); |
b3b94faa5 [GFS2] The core o... |
731 |
struct gfs2_rgrp_list rlist; |
cd915493f [GFS2] Change all... |
732 733 |
u64 bn, bstart; u32 blen; |
b44b84d76 [GFS2] gfs2 misc ... |
734 |
__be64 *p; |
b3b94faa5 [GFS2] The core o... |
735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 |
unsigned int rg_blocks = 0; int metadata; unsigned int revokes = 0; int x; int error; if (!*top) sm->sm_first = 0; if (height != sm->sm_height) return 0; if (sm->sm_first) { top++; sm->sm_first = 0; } |
ecc30c791 [GFS2] Streamline... |
751 |
metadata = (height != ip->i_height - 1); |
b3b94faa5 [GFS2] The core o... |
752 753 |
if (metadata) revokes = (height) ? sdp->sd_inptrs : sdp->sd_diptrs; |
6dbd82248 [GFS2] Reduce ino... |
754 |
error = gfs2_rindex_hold(sdp, &ip->i_alloc->al_ri_gh); |
b3b94faa5 [GFS2] The core o... |
755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 |
if (error) return error; memset(&rlist, 0, sizeof(struct gfs2_rgrp_list)); bstart = 0; blen = 0; for (p = top; p < bottom; p++) { if (!*p) continue; bn = be64_to_cpu(*p); if (bstart + blen == bn) blen++; else { if (bstart) gfs2_rlist_add(sdp, &rlist, bstart); bstart = bn; blen = 1; } } if (bstart) gfs2_rlist_add(sdp, &rlist, bstart); else goto out; /* Nothing to do */ |
fe6c991c5 [GFS2] Get rid of... |
783 |
gfs2_rlist_alloc(&rlist, LM_ST_EXCLUSIVE); |
b3b94faa5 [GFS2] The core o... |
784 785 786 |
for (x = 0; x < rlist.rl_rgrps; x++) { struct gfs2_rgrpd *rgd; |
5c676f6d3 [GFS2] Macros rem... |
787 |
rgd = rlist.rl_ghs[x].gh_gl->gl_object; |
bb8d8a6f5 [GFS2] Fix sign p... |
788 |
rg_blocks += rgd->rd_length; |
b3b94faa5 [GFS2] The core o... |
789 790 791 792 793 794 795 796 797 798 799 800 801 |
} error = gfs2_glock_nq_m(rlist.rl_rgrps, rlist.rl_ghs); if (error) goto out_rlist; error = gfs2_trans_begin(sdp, rg_blocks + RES_DINODE + RES_INDIRECT + RES_STATFS + RES_QUOTA, revokes); if (error) goto out_rg_gunlock; down_write(&ip->i_rw_mutex); |
d4e9c4c3b [GFS2] Add an add... |
802 803 |
gfs2_trans_add_bh(ip->i_gl, dibh, 1); gfs2_trans_add_bh(ip->i_gl, bh, 1); |
b3b94faa5 [GFS2] The core o... |
804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 |
bstart = 0; blen = 0; for (p = top; p < bottom; p++) { if (!*p) continue; bn = be64_to_cpu(*p); if (bstart + blen == bn) blen++; else { if (bstart) { if (metadata) gfs2_free_meta(ip, bstart, blen); else gfs2_free_data(ip, bstart, blen); } bstart = bn; blen = 1; } *p = 0; |
77658aad2 [GFS2] Eliminate ... |
829 |
gfs2_add_inode_blocks(&ip->i_inode, -1); |
b3b94faa5 [GFS2] The core o... |
830 831 832 833 834 835 836 |
} if (bstart) { if (metadata) gfs2_free_meta(ip, bstart, blen); else gfs2_free_data(ip, bstart, blen); } |
4bd91ba18 [GFS2] Add nanose... |
837 |
ip->i_inode.i_mtime = ip->i_inode.i_ctime = CURRENT_TIME; |
b3b94faa5 [GFS2] The core o... |
838 |
|
539e5d6b7 [GFS2] Change arg... |
839 |
gfs2_dinode_out(ip, dibh->b_data); |
b3b94faa5 [GFS2] The core o... |
840 841 842 843 |
up_write(&ip->i_rw_mutex); gfs2_trans_end(sdp); |
a91ea69ff [GFS2] Align all ... |
844 |
out_rg_gunlock: |
b3b94faa5 [GFS2] The core o... |
845 |
gfs2_glock_dq_m(rlist.rl_rgrps, rlist.rl_ghs); |
a91ea69ff [GFS2] Align all ... |
846 |
out_rlist: |
b3b94faa5 [GFS2] The core o... |
847 |
gfs2_rlist_free(&rlist); |
a91ea69ff [GFS2] Align all ... |
848 |
out: |
6dbd82248 [GFS2] Reduce ino... |
849 |
gfs2_glock_dq_uninit(&ip->i_alloc->al_ri_gh); |
b3b94faa5 [GFS2] The core o... |
850 851 852 853 854 855 856 857 858 859 860 861 |
return error; } /** * do_grow - Make a file look bigger than it is * @ip: the inode * @size: the size to set the file to * * Called with an exclusive lock on @ip. * * Returns: errno */ |
cd915493f [GFS2] Change all... |
862 |
static int do_grow(struct gfs2_inode *ip, u64 size) |
b3b94faa5 [GFS2] The core o... |
863 |
{ |
feaa7bba0 [GFS2] Fix unlink... |
864 |
struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); |
b3b94faa5 [GFS2] The core o... |
865 866 |
struct gfs2_alloc *al; struct buffer_head *dibh; |
b3b94faa5 [GFS2] The core o... |
867 868 869 |
int error; al = gfs2_alloc_get(ip); |
182fe5abd [GFS2] possible n... |
870 871 |
if (!al) return -ENOMEM; |
b3b94faa5 [GFS2] The core o... |
872 |
|
d82661d96 [GFS2] Streamline... |
873 |
error = gfs2_quota_lock_check(ip); |
b3b94faa5 [GFS2] The core o... |
874 875 |
if (error) goto out; |
b3b94faa5 [GFS2] The core o... |
876 877 878 879 880 881 882 |
al->al_requested = sdp->sd_max_height + RES_DATA; error = gfs2_inplace_reserve(ip); if (error) goto out_gunlock_q; error = gfs2_trans_begin(sdp, |
bb8d8a6f5 [GFS2] Fix sign p... |
883 |
sdp->sd_max_height + al->al_rgd->rd_length + |
b3b94faa5 [GFS2] The core o... |
884 885 886 |
RES_JDATA + RES_DINODE + RES_STATFS + RES_QUOTA, 0); if (error) goto out_ipres; |
9b8c81d1d [GFS2] Allow bmap... |
887 888 889 |
error = gfs2_meta_inode_buffer(ip, &dibh); if (error) goto out_end_trans; |
b3b94faa5 [GFS2] The core o... |
890 891 |
if (size > sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode)) { if (gfs2_is_stuffed(ip)) { |
f25ef0c1b [GFS2] Tidy gfs2_... |
892 |
error = gfs2_unstuff_dinode(ip, NULL); |
b3b94faa5 [GFS2] The core o... |
893 |
if (error) |
9b8c81d1d [GFS2] Allow bmap... |
894 |
goto out_brelse; |
b3b94faa5 [GFS2] The core o... |
895 896 |
} } |
c9e988867 GFS2: Move i_size... |
897 |
ip->i_disksize = size; |
4bd91ba18 [GFS2] Add nanose... |
898 |
ip->i_inode.i_mtime = ip->i_inode.i_ctime = CURRENT_TIME; |
d4e9c4c3b [GFS2] Add an add... |
899 |
gfs2_trans_add_bh(ip->i_gl, dibh, 1); |
539e5d6b7 [GFS2] Change arg... |
900 |
gfs2_dinode_out(ip, dibh->b_data); |
b3b94faa5 [GFS2] The core o... |
901 |
|
9b8c81d1d [GFS2] Allow bmap... |
902 903 |
out_brelse: brelse(dibh); |
a91ea69ff [GFS2] Align all ... |
904 |
out_end_trans: |
b3b94faa5 [GFS2] The core o... |
905 |
gfs2_trans_end(sdp); |
a91ea69ff [GFS2] Align all ... |
906 |
out_ipres: |
b3b94faa5 [GFS2] The core o... |
907 |
gfs2_inplace_release(ip); |
a91ea69ff [GFS2] Align all ... |
908 |
out_gunlock_q: |
b3b94faa5 [GFS2] The core o... |
909 |
gfs2_quota_unlock(ip); |
a91ea69ff [GFS2] Align all ... |
910 |
out: |
b3b94faa5 [GFS2] The core o... |
911 |
gfs2_alloc_put(ip); |
b3b94faa5 [GFS2] The core o... |
912 913 |
return error; } |
ba7f72901 [GFS2] Remove pag... |
914 915 916 917 918 919 920 921 922 923 |
/** * gfs2_block_truncate_page - Deal with zeroing out data for truncate * * This is partly borrowed from ext3. */ static int gfs2_block_truncate_page(struct address_space *mapping) { struct inode *inode = mapping->host; struct gfs2_inode *ip = GFS2_I(inode); |
ba7f72901 [GFS2] Remove pag... |
924 925 926 927 928 929 |
loff_t from = inode->i_size; unsigned long index = from >> PAGE_CACHE_SHIFT; unsigned offset = from & (PAGE_CACHE_SIZE-1); unsigned blocksize, iblock, length, pos; struct buffer_head *bh; struct page *page; |
ba7f72901 [GFS2] Remove pag... |
930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 |
int err; page = grab_cache_page(mapping, index); if (!page) return 0; blocksize = inode->i_sb->s_blocksize; length = blocksize - (offset & (blocksize - 1)); iblock = index << (PAGE_CACHE_SHIFT - inode->i_sb->s_blocksize_bits); 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)) { |
e9e1ef2b6 [GFS2] Remove fun... |
955 |
gfs2_block_map(inode, iblock, bh, 0); |
ba7f72901 [GFS2] Remove pag... |
956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 |
/* 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); if (!buffer_uptodate(bh)) { err = -EIO; ll_rw_block(READ, 1, &bh); wait_on_buffer(bh); /* Uhhuh. Read error. Complain and punt. */ if (!buffer_uptodate(bh)) goto unlock; |
1875f2f31 [GFS2] Fix gfs2_b... |
972 |
err = 0; |
ba7f72901 [GFS2] Remove pag... |
973 |
} |
bf36a7131 [GFS2] Add gfs2_i... |
974 |
if (!gfs2_is_writeback(ip)) |
ba7f72901 [GFS2] Remove pag... |
975 |
gfs2_trans_add_bh(ip->i_gl, bh, 0); |
eebd2aa35 Pagecache zeroing... |
976 |
zero_user(page, offset, length); |
40bc9a27e GFS2: Fix cache c... |
977 |
mark_buffer_dirty(bh); |
ba7f72901 [GFS2] Remove pag... |
978 979 980 981 982 |
unlock: unlock_page(page); page_cache_release(page); return err; } |
cd915493f [GFS2] Change all... |
983 |
static int trunc_start(struct gfs2_inode *ip, u64 size) |
b3b94faa5 [GFS2] The core o... |
984 |
{ |
feaa7bba0 [GFS2] Fix unlink... |
985 |
struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); |
b3b94faa5 [GFS2] The core o... |
986 987 988 989 990 |
struct buffer_head *dibh; int journaled = gfs2_is_jdata(ip); int error; error = gfs2_trans_begin(sdp, |
c53921248 [GFS2] More style... |
991 |
RES_DINODE + (journaled ? RES_JDATA : 0), 0); |
b3b94faa5 [GFS2] The core o... |
992 993 994 995 996 997 998 999 |
if (error) return error; error = gfs2_meta_inode_buffer(ip, &dibh); if (error) goto out; if (gfs2_is_stuffed(ip)) { |
c639d5d8f GFS2: Fix typo in... |
1000 |
u64 dsize = size + sizeof(struct gfs2_dinode); |
a8bf2bc21 GFS2: O_TRUNC not... |
1001 |
ip->i_disksize = size; |
4bd91ba18 [GFS2] Add nanose... |
1002 |
ip->i_inode.i_mtime = ip->i_inode.i_ctime = CURRENT_TIME; |
d4e9c4c3b [GFS2] Add an add... |
1003 |
gfs2_trans_add_bh(ip->i_gl, dibh, 1); |
539e5d6b7 [GFS2] Change arg... |
1004 |
gfs2_dinode_out(ip, dibh->b_data); |
602c89d2e GFS2: Clean up st... |
1005 1006 1007 |
if (dsize > dibh->b_size) dsize = dibh->b_size; gfs2_buffer_clear_tail(dibh, dsize); |
b3b94faa5 [GFS2] The core o... |
1008 |
error = 1; |
b3b94faa5 [GFS2] The core o... |
1009 |
} else { |
cd915493f [GFS2] Change all... |
1010 |
if (size & (u64)(sdp->sd_sb.sb_bsize - 1)) |
feaa7bba0 [GFS2] Fix unlink... |
1011 |
error = gfs2_block_truncate_page(ip->i_inode.i_mapping); |
b3b94faa5 [GFS2] The core o... |
1012 1013 |
if (!error) { |
c9e988867 GFS2: Move i_size... |
1014 |
ip->i_disksize = size; |
4bd91ba18 [GFS2] Add nanose... |
1015 |
ip->i_inode.i_mtime = ip->i_inode.i_ctime = CURRENT_TIME; |
383f01fbf GFS2: Banish stru... |
1016 |
ip->i_diskflags |= GFS2_DIF_TRUNC_IN_PROG; |
d4e9c4c3b [GFS2] Add an add... |
1017 |
gfs2_trans_add_bh(ip->i_gl, dibh, 1); |
539e5d6b7 [GFS2] Change arg... |
1018 |
gfs2_dinode_out(ip, dibh->b_data); |
b3b94faa5 [GFS2] The core o... |
1019 1020 1021 1022 |
} } brelse(dibh); |
a91ea69ff [GFS2] Align all ... |
1023 |
out: |
b3b94faa5 [GFS2] The core o... |
1024 |
gfs2_trans_end(sdp); |
b3b94faa5 [GFS2] The core o... |
1025 1026 |
return error; } |
cd915493f [GFS2] Change all... |
1027 |
static int trunc_dealloc(struct gfs2_inode *ip, u64 size) |
b3b94faa5 [GFS2] The core o... |
1028 |
{ |
9b8c81d1d [GFS2] Allow bmap... |
1029 |
struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); |
ecc30c791 [GFS2] Streamline... |
1030 |
unsigned int height = ip->i_height; |
cd915493f [GFS2] Change all... |
1031 |
u64 lblock; |
b3b94faa5 [GFS2] The core o... |
1032 1033 1034 1035 1036 |
struct metapath mp; int error; if (!size) lblock = 0; |
18ec7d5c3 [GFS2] Make journ... |
1037 |
else |
9b8c81d1d [GFS2] Allow bmap... |
1038 |
lblock = (size - 1) >> sdp->sd_sb.sb_bsize_shift; |
b3b94faa5 [GFS2] The core o... |
1039 |
|
9b8c81d1d [GFS2] Allow bmap... |
1040 |
find_metapath(sdp, lblock, &mp, ip->i_height); |
182fe5abd [GFS2] possible n... |
1041 1042 |
if (!gfs2_alloc_get(ip)) return -ENOMEM; |
b3b94faa5 [GFS2] The core o... |
1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 |
error = gfs2_quota_hold(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE); if (error) goto out; while (height--) { struct strip_mine sm; sm.sm_first = !!size; sm.sm_height = height; error = recursive_scan(ip, NULL, &mp, 0, 0, 1, do_strip, &sm); if (error) break; } gfs2_quota_unhold(ip); |
a91ea69ff [GFS2] Align all ... |
1059 |
out: |
b3b94faa5 [GFS2] The core o... |
1060 1061 1062 1063 1064 1065 |
gfs2_alloc_put(ip); return error; } static int trunc_end(struct gfs2_inode *ip) { |
feaa7bba0 [GFS2] Fix unlink... |
1066 |
struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); |
b3b94faa5 [GFS2] The core o... |
1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 |
struct buffer_head *dibh; int error; error = gfs2_trans_begin(sdp, RES_DINODE, 0); if (error) return error; down_write(&ip->i_rw_mutex); error = gfs2_meta_inode_buffer(ip, &dibh); if (error) goto out; |
c9e988867 GFS2: Move i_size... |
1079 |
if (!ip->i_disksize) { |
ecc30c791 [GFS2] Streamline... |
1080 |
ip->i_height = 0; |
ce276b06e [GFS2] Reduce ino... |
1081 |
ip->i_goal = ip->i_no_addr; |
b3b94faa5 [GFS2] The core o... |
1082 1083 |
gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode)); } |
4bd91ba18 [GFS2] Add nanose... |
1084 |
ip->i_inode.i_mtime = ip->i_inode.i_ctime = CURRENT_TIME; |
383f01fbf GFS2: Banish stru... |
1085 |
ip->i_diskflags &= ~GFS2_DIF_TRUNC_IN_PROG; |
b3b94faa5 [GFS2] The core o... |
1086 |
|
d4e9c4c3b [GFS2] Add an add... |
1087 |
gfs2_trans_add_bh(ip->i_gl, dibh, 1); |
539e5d6b7 [GFS2] Change arg... |
1088 |
gfs2_dinode_out(ip, dibh->b_data); |
b3b94faa5 [GFS2] The core o... |
1089 |
brelse(dibh); |
a91ea69ff [GFS2] Align all ... |
1090 |
out: |
b3b94faa5 [GFS2] The core o... |
1091 |
up_write(&ip->i_rw_mutex); |
b3b94faa5 [GFS2] The core o... |
1092 |
gfs2_trans_end(sdp); |
b3b94faa5 [GFS2] The core o... |
1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 |
return error; } /** * do_shrink - make a file smaller * @ip: the inode * @size: the size to make the file * @truncator: function to truncate the last partial block * * Called with an exclusive lock on @ip. * * Returns: errno */ |
cd915493f [GFS2] Change all... |
1106 |
static int do_shrink(struct gfs2_inode *ip, u64 size) |
b3b94faa5 [GFS2] The core o... |
1107 1108 |
{ int error; |
aa6a85a97 [GFS2] Remove poi... |
1109 |
error = trunc_start(ip, size); |
b3b94faa5 [GFS2] The core o... |
1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 |
if (error < 0) return error; if (error > 0) return 0; error = trunc_dealloc(ip, size); if (!error) error = trunc_end(ip); return error; } |
a13b8c5f2 [GFS2] Reduce tru... |
1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 |
static int do_touch(struct gfs2_inode *ip, u64 size) { struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); struct buffer_head *dibh; int error; error = gfs2_trans_begin(sdp, RES_DINODE, 0); if (error) return error; down_write(&ip->i_rw_mutex); error = gfs2_meta_inode_buffer(ip, &dibh); if (error) goto do_touch_out; ip->i_inode.i_mtime = ip->i_inode.i_ctime = CURRENT_TIME; gfs2_trans_add_bh(ip->i_gl, dibh, 1); gfs2_dinode_out(ip, dibh->b_data); brelse(dibh); do_touch_out: up_write(&ip->i_rw_mutex); gfs2_trans_end(sdp); return error; } |
b3b94faa5 [GFS2] The core o... |
1147 |
/** |
666a2c534 [GFS2] Remove unu... |
1148 |
* gfs2_truncatei - make a file a given size |
b3b94faa5 [GFS2] The core o... |
1149 1150 1151 1152 1153 1154 1155 1156 |
* @ip: the inode * @size: the size to make the file * @truncator: function to truncate the last partial block * * The file size can grow, shrink, or stay the same size. * * Returns: errno */ |
cd915493f [GFS2] Change all... |
1157 |
int gfs2_truncatei(struct gfs2_inode *ip, u64 size) |
b3b94faa5 [GFS2] The core o... |
1158 1159 |
{ int error; |
b60623c23 [GFS2] Shrink gfs... |
1160 |
if (gfs2_assert_warn(GFS2_SB(&ip->i_inode), S_ISREG(ip->i_inode.i_mode))) |
b3b94faa5 [GFS2] The core o... |
1161 |
return -EINVAL; |
c9e988867 GFS2: Move i_size... |
1162 |
if (size > ip->i_disksize) |
b3b94faa5 [GFS2] The core o... |
1163 |
error = do_grow(ip, size); |
c9e988867 GFS2: Move i_size... |
1164 |
else if (size < ip->i_disksize) |
aa6a85a97 [GFS2] Remove poi... |
1165 |
error = do_shrink(ip, size); |
a13b8c5f2 [GFS2] Reduce tru... |
1166 1167 1168 |
else /* update time stamps */ error = do_touch(ip, size); |
b3b94faa5 [GFS2] The core o... |
1169 1170 1171 1172 1173 1174 1175 |
return error; } int gfs2_truncatei_resume(struct gfs2_inode *ip) { int error; |
c9e988867 GFS2: Move i_size... |
1176 |
error = trunc_dealloc(ip, ip->i_disksize); |
b3b94faa5 [GFS2] The core o... |
1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 |
if (!error) error = trunc_end(ip); return error; } int gfs2_file_dealloc(struct gfs2_inode *ip) { return trunc_dealloc(ip, 0); } /** |
b3b94faa5 [GFS2] The core o... |
1188 1189 1190 1191 |
* gfs2_write_alloc_required - figure out if a write will require an allocation * @ip: the file being written to * @offset: the offset to write to * @len: the number of bytes being written |
b3b94faa5 [GFS2] The core o... |
1192 |
* |
461cb419f GFS2: Simplify gf... |
1193 |
* Returns: 1 if an alloc is required, 0 otherwise |
b3b94faa5 [GFS2] The core o... |
1194 |
*/ |
cd915493f [GFS2] Change all... |
1195 |
int gfs2_write_alloc_required(struct gfs2_inode *ip, u64 offset, |
461cb419f GFS2: Simplify gf... |
1196 |
unsigned int len) |
b3b94faa5 [GFS2] The core o... |
1197 |
{ |
feaa7bba0 [GFS2] Fix unlink... |
1198 |
struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); |
941e6d7d0 [GFS2] Speed up g... |
1199 1200 1201 |
struct buffer_head bh; unsigned int shift; u64 lblock, lblock_stop, size; |
7ed122e42 GFS2: Streamline ... |
1202 |
u64 end_of_file; |
b3b94faa5 [GFS2] The core o... |
1203 |
|
b3b94faa5 [GFS2] The core o... |
1204 1205 1206 1207 1208 1209 |
if (!len) return 0; if (gfs2_is_stuffed(ip)) { if (offset + len > sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode)) |
461cb419f GFS2: Simplify gf... |
1210 |
return 1; |
b3b94faa5 [GFS2] The core o... |
1211 1212 |
return 0; } |
941e6d7d0 [GFS2] Speed up g... |
1213 |
shift = sdp->sd_sb.sb_bsize_shift; |
7ed122e42 GFS2: Streamline ... |
1214 1215 1216 1217 1218 |
BUG_ON(gfs2_is_dir(ip)); end_of_file = (ip->i_disksize + sdp->sd_sb.sb_bsize - 1) >> shift; lblock = offset >> shift; lblock_stop = (offset + len + sdp->sd_sb.sb_bsize - 1) >> shift; if (lblock_stop > end_of_file) |
461cb419f GFS2: Simplify gf... |
1219 |
return 1; |
b3b94faa5 [GFS2] The core o... |
1220 |
|
941e6d7d0 [GFS2] Speed up g... |
1221 1222 1223 1224 1225 1226 |
size = (lblock_stop - lblock) << shift; do { bh.b_state = 0; bh.b_size = size; gfs2_block_map(&ip->i_inode, lblock, &bh, 0); if (!buffer_mapped(&bh)) |
461cb419f GFS2: Simplify gf... |
1227 |
return 1; |
941e6d7d0 [GFS2] Speed up g... |
1228 1229 1230 |
size -= bh.b_size; lblock += (bh.b_size >> ip->i_inode.i_blkbits); } while(size > 0); |
b3b94faa5 [GFS2] The core o... |
1231 1232 1233 |
return 0; } |