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net/ceph/pagevec.c
4.2 KB
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#include <linux/ceph/ceph_debug.h> #include <linux/module.h> #include <linux/sched.h> #include <linux/slab.h> #include <linux/file.h> #include <linux/namei.h> #include <linux/writeback.h> #include <linux/ceph/libceph.h> /* * build a vector of user pages */ |
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struct page **ceph_get_direct_page_vector(const void __user *data, |
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int num_pages, bool write_page) |
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{ struct page **pages; |
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int got = 0; int rc = 0; |
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pages = kmalloc(sizeof(*pages) * num_pages, GFP_NOFS); if (!pages) return ERR_PTR(-ENOMEM); down_read(¤t->mm->mmap_sem); |
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while (got < num_pages) { rc = get_user_pages(current, current->mm, (unsigned long)data + ((unsigned long)got * PAGE_SIZE), num_pages - got, write_page, 0, pages + got, NULL); if (rc < 0) break; BUG_ON(rc == 0); got += rc; } |
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up_read(¤t->mm->mmap_sem); |
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if (rc < 0) |
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goto fail; return pages; fail: |
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ceph_put_page_vector(pages, got, false); |
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return ERR_PTR(rc); } EXPORT_SYMBOL(ceph_get_direct_page_vector); |
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void ceph_put_page_vector(struct page **pages, int num_pages, bool dirty) |
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{ int i; |
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for (i = 0; i < num_pages; i++) { if (dirty) set_page_dirty_lock(pages[i]); |
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put_page(pages[i]); |
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} |
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if (is_vmalloc_addr(pages)) vfree(pages); else kfree(pages); |
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} EXPORT_SYMBOL(ceph_put_page_vector); void ceph_release_page_vector(struct page **pages, int num_pages) { int i; for (i = 0; i < num_pages; i++) __free_pages(pages[i], 0); kfree(pages); } EXPORT_SYMBOL(ceph_release_page_vector); /* * allocate a vector new pages */ struct page **ceph_alloc_page_vector(int num_pages, gfp_t flags) { struct page **pages; int i; pages = kmalloc(sizeof(*pages) * num_pages, flags); if (!pages) return ERR_PTR(-ENOMEM); for (i = 0; i < num_pages; i++) { pages[i] = __page_cache_alloc(flags); if (pages[i] == NULL) { ceph_release_page_vector(pages, i); return ERR_PTR(-ENOMEM); } } return pages; } EXPORT_SYMBOL(ceph_alloc_page_vector); /* * copy user data into a page vector */ int ceph_copy_user_to_page_vector(struct page **pages, |
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const void __user *data, |
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loff_t off, size_t len) { int i = 0; int po = off & ~PAGE_CACHE_MASK; int left = len; int l, bad; while (left > 0) { l = min_t(int, PAGE_CACHE_SIZE-po, left); bad = copy_from_user(page_address(pages[i]) + po, data, l); if (bad == l) return -EFAULT; data += l - bad; left -= l - bad; po += l - bad; if (po == PAGE_CACHE_SIZE) { po = 0; i++; } } return len; } EXPORT_SYMBOL(ceph_copy_user_to_page_vector); |
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void ceph_copy_to_page_vector(struct page **pages, |
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const void *data, |
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loff_t off, size_t len) { int i = 0; size_t po = off & ~PAGE_CACHE_MASK; size_t left = len; |
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while (left > 0) { |
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size_t l = min_t(size_t, PAGE_CACHE_SIZE-po, left); |
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memcpy(page_address(pages[i]) + po, data, l); data += l; left -= l; po += l; if (po == PAGE_CACHE_SIZE) { po = 0; i++; } } |
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} EXPORT_SYMBOL(ceph_copy_to_page_vector); |
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void ceph_copy_from_page_vector(struct page **pages, |
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void *data, |
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loff_t off, size_t len) { int i = 0; size_t po = off & ~PAGE_CACHE_MASK; size_t left = len; |
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while (left > 0) { |
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size_t l = min_t(size_t, PAGE_CACHE_SIZE-po, left); |
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memcpy(data, page_address(pages[i]) + po, l); data += l; left -= l; po += l; if (po == PAGE_CACHE_SIZE) { po = 0; i++; } } |
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} EXPORT_SYMBOL(ceph_copy_from_page_vector); /* |
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* Zero an extent within a page vector. Offset is relative to the * start of the first page. */ void ceph_zero_page_vector_range(int off, int len, struct page **pages) { int i = off >> PAGE_CACHE_SHIFT; off &= ~PAGE_CACHE_MASK; dout("zero_page_vector_page %u~%u ", off, len); /* leading partial page? */ if (off) { int end = min((int)PAGE_CACHE_SIZE, off + len); dout("zeroing %d %p head from %d ", i, pages[i], (int)off); zero_user_segment(pages[i], off, end); len -= (end - off); i++; } while (len >= PAGE_CACHE_SIZE) { dout("zeroing %d %p len=%d ", i, pages[i], len); zero_user_segment(pages[i], 0, PAGE_CACHE_SIZE); len -= PAGE_CACHE_SIZE; i++; } /* trailing partial page? */ if (len) { dout("zeroing %d %p tail to %d ", i, pages[i], (int)len); zero_user_segment(pages[i], 0, len); } } EXPORT_SYMBOL(ceph_zero_page_vector_range); |