diff options
author | Steve French <sfrench@hera.kernel.org> | 2005-07-19 14:36:00 -0700 |
---|---|---|
committer | Steve French <sfrench@hera.kernel.org> | 2005-07-19 14:36:00 -0700 |
commit | 076fb01e8238b7e5d68ba0d729c0ff7716d1d8ec (patch) | |
tree | abcaefe016870427ed289748cb0b936575d60593 /fs/ntfs/aops.c | |
parent | 4c48b0d3d1c7ff9f13134b30e41c6e81a92027bf (diff) | |
parent | f60f700876cd51de9de69f3a3c865d95e287a24d (diff) |
Merge with rsync://rsync.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6.git
Diffstat (limited to 'fs/ntfs/aops.c')
-rw-r--r-- | fs/ntfs/aops.c | 166 |
1 files changed, 110 insertions, 56 deletions
diff --git a/fs/ntfs/aops.c b/fs/ntfs/aops.c index 45d56e41ed9..3f43bfe6184 100644 --- a/fs/ntfs/aops.c +++ b/fs/ntfs/aops.c @@ -2,7 +2,7 @@ * aops.c - NTFS kernel address space operations and page cache handling. * Part of the Linux-NTFS project. * - * Copyright (c) 2001-2004 Anton Altaparmakov + * Copyright (c) 2001-2005 Anton Altaparmakov * Copyright (c) 2002 Richard Russon * * This program/include file is free software; you can redistribute it and/or @@ -66,19 +66,22 @@ static void ntfs_end_buffer_async_read(struct buffer_head *bh, int uptodate) ni = NTFS_I(page->mapping->host); if (likely(uptodate)) { - s64 file_ofs; + s64 file_ofs, initialized_size; set_buffer_uptodate(bh); file_ofs = ((s64)page->index << PAGE_CACHE_SHIFT) + bh_offset(bh); + read_lock_irqsave(&ni->size_lock, flags); + initialized_size = ni->initialized_size; + read_unlock_irqrestore(&ni->size_lock, flags); /* Check for the current buffer head overflowing. */ - if (file_ofs + bh->b_size > ni->initialized_size) { + if (file_ofs + bh->b_size > initialized_size) { char *addr; int ofs = 0; - if (file_ofs < ni->initialized_size) - ofs = ni->initialized_size - file_ofs; + if (file_ofs < initialized_size) + ofs = initialized_size - file_ofs; addr = kmap_atomic(page, KM_BIO_SRC_IRQ); memset(addr + bh_offset(bh) + ofs, 0, bh->b_size - ofs); flush_dcache_page(page); @@ -132,7 +135,7 @@ static void ntfs_end_buffer_async_read(struct buffer_head *bh, int uptodate) i * rec_size), rec_size); flush_dcache_page(page); kunmap_atomic(addr, KM_BIO_SRC_IRQ); - if (likely(!PageError(page) && page_uptodate)) + if (likely(page_uptodate && !PageError(page))) SetPageUptodate(page); } unlock_page(page); @@ -168,6 +171,7 @@ static int ntfs_read_block(struct page *page) runlist_element *rl; struct buffer_head *bh, *head, *arr[MAX_BUF_PER_PAGE]; sector_t iblock, lblock, zblock; + unsigned long flags; unsigned int blocksize, vcn_ofs; int i, nr; unsigned char blocksize_bits; @@ -190,8 +194,10 @@ static int ntfs_read_block(struct page *page) } iblock = (s64)page->index << (PAGE_CACHE_SHIFT - blocksize_bits); + read_lock_irqsave(&ni->size_lock, flags); lblock = (ni->allocated_size + blocksize - 1) >> blocksize_bits; zblock = (ni->initialized_size + blocksize - 1) >> blocksize_bits; + read_unlock_irqrestore(&ni->size_lock, flags); /* Loop through all the buffers in the page. */ rl = NULL; @@ -258,7 +264,8 @@ lock_retry_remap: goto lock_retry_remap; rl = NULL; lcn = err; - } + } else if (!rl) + up_read(&ni->runlist.lock); /* Hard error, zero out region. */ bh->b_blocknr = -1; SetPageError(page); @@ -341,14 +348,15 @@ handle_zblock: */ static int ntfs_readpage(struct file *file, struct page *page) { - loff_t i_size; ntfs_inode *ni, *base_ni; u8 *kaddr; ntfs_attr_search_ctx *ctx; MFT_RECORD *mrec; + unsigned long flags; u32 attr_len; int err = 0; +retry_readpage: BUG_ON(!PageLocked(page)); /* * This can potentially happen because we clear PageUptodate() during @@ -383,9 +391,9 @@ static int ntfs_readpage(struct file *file, struct page *page) * Attribute is resident, implying it is not compressed or encrypted. * This also means the attribute is smaller than an mft record and * hence smaller than a page, so can simply zero out any pages with - * index above 0. We can also do this if the file size is 0. + * index above 0. */ - if (unlikely(page->index > 0 || !i_size_read(VFS_I(ni)))) { + if (unlikely(page->index > 0)) { kaddr = kmap_atomic(page, KM_USER0); memset(kaddr, 0, PAGE_CACHE_SIZE); flush_dcache_page(page); @@ -402,6 +410,14 @@ static int ntfs_readpage(struct file *file, struct page *page) err = PTR_ERR(mrec); goto err_out; } + /* + * If a parallel write made the attribute non-resident, drop the mft + * record and retry the readpage. + */ + if (unlikely(NInoNonResident(ni))) { + unmap_mft_record(base_ni); + goto retry_readpage; + } ctx = ntfs_attr_get_search_ctx(base_ni, mrec); if (unlikely(!ctx)) { err = -ENOMEM; @@ -412,9 +428,10 @@ static int ntfs_readpage(struct file *file, struct page *page) if (unlikely(err)) goto put_unm_err_out; attr_len = le32_to_cpu(ctx->attr->data.resident.value_length); - i_size = i_size_read(VFS_I(ni)); - if (unlikely(attr_len > i_size)) - attr_len = i_size; + read_lock_irqsave(&ni->size_lock, flags); + if (unlikely(attr_len > ni->initialized_size)) + attr_len = ni->initialized_size; + read_unlock_irqrestore(&ni->size_lock, flags); kaddr = kmap_atomic(page, KM_USER0); /* Copy the data to the page. */ memcpy(kaddr, (u8*)ctx->attr + @@ -463,12 +480,15 @@ static int ntfs_write_block(struct page *page, struct writeback_control *wbc) { VCN vcn; LCN lcn; + s64 initialized_size; + loff_t i_size; sector_t block, dblock, iblock; struct inode *vi; ntfs_inode *ni; ntfs_volume *vol; runlist_element *rl; struct buffer_head *bh, *head; + unsigned long flags; unsigned int blocksize, vcn_ofs; int err; BOOL need_end_writeback; @@ -510,11 +530,16 @@ static int ntfs_write_block(struct page *page, struct writeback_control *wbc) /* The first block in the page. */ block = (s64)page->index << (PAGE_CACHE_SHIFT - blocksize_bits); + read_lock_irqsave(&ni->size_lock, flags); + i_size = i_size_read(vi); + initialized_size = ni->initialized_size; + read_unlock_irqrestore(&ni->size_lock, flags); + /* The first out of bounds block for the data size. */ - dblock = (vi->i_size + blocksize - 1) >> blocksize_bits; + dblock = (i_size + blocksize - 1) >> blocksize_bits; /* The last (fully or partially) initialized block. */ - iblock = ni->initialized_size >> blocksize_bits; + iblock = initialized_size >> blocksize_bits; /* * Be very careful. We have no exclusion from __set_page_dirty_buffers @@ -559,7 +584,7 @@ static int ntfs_write_block(struct page *page, struct writeback_control *wbc) /* Make sure we have enough initialized size. */ if (unlikely((block >= iblock) && - (ni->initialized_size < vi->i_size))) { + (initialized_size < i_size))) { /* * If this page is fully outside initialized size, zero * out all pages between the current initialized size @@ -666,7 +691,8 @@ lock_retry_remap: goto lock_retry_remap; rl = NULL; lcn = err; - } + } else if (!rl) + up_read(&ni->runlist.lock); /* Failed to map the buffer, even after retrying. */ bh->b_blocknr = -1; ntfs_error(vol->sb, "Failed to write to inode 0x%lx, " @@ -801,17 +827,15 @@ static int ntfs_write_mst_block(struct page *page, ntfs_inode *ni = NTFS_I(vi); ntfs_volume *vol = ni->vol; u8 *kaddr; - unsigned char bh_size_bits = vi->i_blkbits; - unsigned int bh_size = 1 << bh_size_bits; unsigned int rec_size = ni->itype.index.block_size; ntfs_inode *locked_nis[PAGE_CACHE_SIZE / rec_size]; struct buffer_head *bh, *head, *tbh, *rec_start_bh; - int max_bhs = PAGE_CACHE_SIZE / bh_size; - struct buffer_head *bhs[max_bhs]; + struct buffer_head *bhs[MAX_BUF_PER_PAGE]; runlist_element *rl; - int i, nr_locked_nis, nr_recs, nr_bhs, bhs_per_rec, err, err2; - unsigned rec_size_bits; + int i, nr_locked_nis, nr_recs, nr_bhs, max_bhs, bhs_per_rec, err, err2; + unsigned bh_size, rec_size_bits; BOOL sync, is_mft, page_is_dirty, rec_is_dirty; + unsigned char bh_size_bits; ntfs_debug("Entering for inode 0x%lx, attribute type 0x%x, page index " "0x%lx.", vi->i_ino, ni->type, page->index); @@ -826,7 +850,11 @@ static int ntfs_write_mst_block(struct page *page, */ BUG_ON(!(is_mft || S_ISDIR(vi->i_mode) || (NInoAttr(ni) && ni->type == AT_INDEX_ALLOCATION))); + bh_size_bits = vi->i_blkbits; + bh_size = 1 << bh_size_bits; + max_bhs = PAGE_CACHE_SIZE / bh_size; BUG_ON(!max_bhs); + BUG_ON(max_bhs > MAX_BUF_PER_PAGE); /* Were we called for sync purposes? */ sync = (wbc->sync_mode == WB_SYNC_ALL); @@ -846,7 +874,7 @@ static int ntfs_write_mst_block(struct page *page, (PAGE_CACHE_SHIFT - bh_size_bits); /* The first out of bounds block for the data size. */ - dblock = (vi->i_size + bh_size - 1) >> bh_size_bits; + dblock = (i_size_read(vi) + bh_size - 1) >> bh_size_bits; rl = NULL; err = err2 = nr_bhs = nr_recs = nr_locked_nis = 0; @@ -858,6 +886,7 @@ static int ntfs_write_mst_block(struct page *page, if (likely(block < rec_block)) { if (unlikely(block >= dblock)) { clear_buffer_dirty(bh); + set_buffer_uptodate(bh); continue; } /* @@ -938,8 +967,11 @@ lock_retry_remap: if (err2 == -ENOMEM) page_is_dirty = TRUE; lcn = err2; - } else + } else { err2 = -EIO; + if (!rl) + up_read(&ni->runlist.lock); + } /* Hard error. Abort writing this record. */ if (!err || err == -ENOMEM) err = err2; @@ -949,7 +981,8 @@ lock_retry_remap: "attribute type 0x%x) because " "its location on disk could " "not be determined (error " - "code %lli).", (s64)block << + "code %lli).", + (long long)block << bh_size_bits >> vol->mft_record_size_bits, ni->mft_no, ni->type, @@ -1223,19 +1256,17 @@ done: static int ntfs_writepage(struct page *page, struct writeback_control *wbc) { loff_t i_size; - struct inode *vi; - ntfs_inode *ni, *base_ni; + struct inode *vi = page->mapping->host; + ntfs_inode *base_ni = NULL, *ni = NTFS_I(vi); char *kaddr; - ntfs_attr_search_ctx *ctx; - MFT_RECORD *m; + ntfs_attr_search_ctx *ctx = NULL; + MFT_RECORD *m = NULL; u32 attr_len; int err; +retry_writepage: BUG_ON(!PageLocked(page)); - - vi = page->mapping->host; i_size = i_size_read(vi); - /* Is the page fully outside i_size? (truncate in progress) */ if (unlikely(page->index >= (i_size + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT)) { @@ -1248,8 +1279,6 @@ static int ntfs_writepage(struct page *page, struct writeback_control *wbc) ntfs_debug("Write outside i_size - truncated?"); return 0; } - ni = NTFS_I(vi); - /* NInoNonResident() == NInoIndexAllocPresent() */ if (NInoNonResident(ni)) { /* @@ -1326,6 +1355,14 @@ static int ntfs_writepage(struct page *page, struct writeback_control *wbc) ctx = NULL; goto err_out; } + /* + * If a parallel write made the attribute non-resident, drop the mft + * record and retry the writepage. + */ + if (unlikely(NInoNonResident(ni))) { + unmap_mft_record(base_ni); + goto retry_writepage; + } ctx = ntfs_attr_get_search_ctx(base_ni, m); if (unlikely(!ctx)) { err = -ENOMEM; @@ -1367,15 +1404,12 @@ static int ntfs_writepage(struct page *page, struct writeback_control *wbc) */ attr_len = le32_to_cpu(ctx->attr->data.resident.value_length); - i_size = i_size_read(VFS_I(ni)); - kaddr = kmap_atomic(page, KM_USER0); + i_size = i_size_read(vi); if (unlikely(attr_len > i_size)) { - /* Zero out of bounds area in the mft record. */ - memset((u8*)ctx->attr + le16_to_cpu( - ctx->attr->data.resident.value_offset) + - i_size, 0, attr_len - i_size); attr_len = i_size; + ctx->attr->data.resident.value_length = cpu_to_le32(attr_len); } + kaddr = kmap_atomic(page, KM_USER0); /* Copy the data from the page to the mft record. */ memcpy((u8*)ctx->attr + le16_to_cpu(ctx->attr->data.resident.value_offset), @@ -1405,8 +1439,10 @@ err_out: err = 0; } else { ntfs_error(vi->i_sb, "Resident attribute write failed with " - "error %i. Setting page error flag.", err); + "error %i.", err); SetPageError(page); + NVolSetErrors(ni->vol); + make_bad_inode(vi); } unlock_page(page); if (ctx) @@ -1425,12 +1461,15 @@ static int ntfs_prepare_nonresident_write(struct page *page, { VCN vcn; LCN lcn; + s64 initialized_size; + loff_t i_size; sector_t block, ablock, iblock; struct inode *vi; ntfs_inode *ni; ntfs_volume *vol; runlist_element *rl; struct buffer_head *bh, *head, *wait[2], **wait_bh = wait; + unsigned long flags; unsigned int vcn_ofs, block_start, block_end, blocksize; int err; BOOL is_retry; @@ -1462,16 +1501,20 @@ static int ntfs_prepare_nonresident_write(struct page *page, /* The first block in the page. */ block = (s64)page->index << (PAGE_CACHE_SHIFT - blocksize_bits); + read_lock_irqsave(&ni->size_lock, flags); /* - * The first out of bounds block for the allocated size. No need to + * The first out of bounds block for the allocated size. No need to * round up as allocated_size is in multiples of cluster size and the * minimum cluster size is 512 bytes, which is equal to the smallest * blocksize. */ ablock = ni->allocated_size >> blocksize_bits; + i_size = i_size_read(vi); + initialized_size = ni->initialized_size; + read_unlock_irqrestore(&ni->size_lock, flags); /* The last (fully or partially) initialized block. */ - iblock = ni->initialized_size >> blocksize_bits; + iblock = initialized_size >> blocksize_bits; /* Loop through all the buffers in the page. */ block_start = 0; @@ -1518,7 +1561,7 @@ static int ntfs_prepare_nonresident_write(struct page *page, * request, i.e. block < ablock is true. */ if (unlikely((block >= iblock) && - (ni->initialized_size < vi->i_size))) { + (initialized_size < i_size))) { /* * If this page is fully outside initialized size, zero * out all pages between the current initialized size @@ -1622,6 +1665,8 @@ lock_retry_remap: "not supported yet. " "Sorry."); err = -EOPNOTSUPP; + if (!rl) + up_read(&ni->runlist.lock); goto err_out; } else if (!is_retry && lcn == LCN_RL_NOT_MAPPED) { @@ -1636,7 +1681,8 @@ lock_retry_remap: goto lock_retry_remap; rl = NULL; lcn = err; - } + } else if (!rl) + up_read(&ni->runlist.lock); /* * Failed to map the buffer, even after * retrying. @@ -1797,6 +1843,7 @@ static int ntfs_prepare_write(struct file *file, struct page *page, unsigned from, unsigned to) { s64 new_size; + loff_t i_size; struct inode *vi = page->mapping->host; ntfs_inode *base_ni = NULL, *ni = NTFS_I(vi); ntfs_volume *vol = ni->vol; @@ -1868,14 +1915,8 @@ static int ntfs_prepare_write(struct file *file, struct page *page, BUG_ON(page_has_buffers(page)); new_size = ((s64)page->index << PAGE_CACHE_SHIFT) + to; /* If we do not need to resize the attribute allocation we are done. */ - if (new_size <= vi->i_size) + if (new_size <= i_size_read(vi)) goto done; - - // FIXME: We abort for now as this code is not safe. - ntfs_error(vi->i_sb, "Changing the file size is not supported yet. " - "Sorry."); - return -EOPNOTSUPP; - /* Map, pin, and lock the (base) mft record. */ if (!NInoAttr(ni)) base_ni = ni; @@ -1904,7 +1945,15 @@ static int ntfs_prepare_write(struct file *file, struct page *page, a = ctx->attr; /* The total length of the attribute value. */ attr_len = le32_to_cpu(a->data.resident.value_length); - BUG_ON(vi->i_size != attr_len); + /* Fix an eventual previous failure of ntfs_commit_write(). */ + i_size = i_size_read(vi); + if (unlikely(attr_len > i_size)) { + attr_len = i_size; + a->data.resident.value_length = cpu_to_le32(attr_len); + } + /* If we do not need to resize the attribute allocation we are done. */ + if (new_size <= attr_len) + goto done_unm; /* Check if new size is allowed in $AttrDef. */ err = ntfs_attr_size_bounds_check(vol, ni->type, new_size); if (unlikely(err)) { @@ -1962,6 +2011,7 @@ static int ntfs_prepare_write(struct file *file, struct page *page, } flush_dcache_mft_record_page(ctx->ntfs_ino); mark_mft_record_dirty(ctx->ntfs_ino); +done_unm: ntfs_attr_put_search_ctx(ctx); unmap_mft_record(base_ni); /* @@ -2047,7 +2097,7 @@ static int ntfs_commit_nonresident_write(struct page *page, * now we know ntfs_prepare_write() would have failed in the write * exceeds i_size case, so this will never trigger which is fine. */ - if (pos > vi->i_size) { + if (pos > i_size_read(vi)) { ntfs_error(vi->i_sb, "Writing beyond the existing file size is " "not supported yet. Sorry."); return -EOPNOTSUPP; @@ -2183,9 +2233,13 @@ static int ntfs_commit_write(struct file *file, struct page *page, } kunmap_atomic(kaddr, KM_USER0); /* Update i_size if necessary. */ - if (vi->i_size < attr_len) { + if (i_size_read(vi) < attr_len) { + unsigned long flags; + + write_lock_irqsave(&ni->size_lock, flags); ni->allocated_size = ni->initialized_size = attr_len; i_size_write(vi, attr_len); + write_unlock_irqrestore(&ni->size_lock, flags); } /* Mark the mft record dirty, so it gets written back. */ flush_dcache_mft_record_page(ctx->ntfs_ino); |