From 5b41395fcc0265fc9f193aef9df39ce49d64677c Mon Sep 17 00:00:00 2001 From: Yongqiang Yang Date: Mon, 4 Apr 2011 15:40:24 -0400 Subject: ext4: fix credits computing for indirect mapped files When writing a contiguous set of blocks, two indirect blocks could be needed depending on how the blocks are aligned, so we need to increase the number of credits needed by one. [ Also fixed a another bug which could further underestimate the number of journal credits needed by 1; the code was using integer division instead of DIV_ROUND_UP() -- tytso] Signed-off-by: Yongqiang Yang Signed-off-by: "Theodore Ts'o" Cc: stable@kernel.org --- fs/ext4/inode.c | 11 +++++------ 1 file changed, 5 insertions(+), 6 deletions(-) (limited to 'fs/ext4/inode.c') diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c index 1a86282b9024..7d11e02ad01d 100644 --- a/fs/ext4/inode.c +++ b/fs/ext4/inode.c @@ -5398,13 +5398,12 @@ static int ext4_indirect_trans_blocks(struct inode *inode, int nrblocks, /* if nrblocks are contiguous */ if (chunk) { /* - * With N contiguous data blocks, it need at most - * N/EXT4_ADDR_PER_BLOCK(inode->i_sb) indirect blocks - * 2 dindirect blocks - * 1 tindirect block + * With N contiguous data blocks, we need at most + * N/EXT4_ADDR_PER_BLOCK(inode->i_sb) + 1 indirect blocks, + * 2 dindirect blocks, and 1 tindirect block */ - indirects = nrblocks / EXT4_ADDR_PER_BLOCK(inode->i_sb); - return indirects + 3; + return DIV_ROUND_UP(nrblocks, + EXT4_ADDR_PER_BLOCK(inode->i_sb)) + 4; } /* * if nrblocks are not contiguous, worse case, each block touch -- cgit v1.2.3 From f80da1e70f1ffec3825aa0a1d0801f4896e002b6 Mon Sep 17 00:00:00 2001 From: Kazuya Mio Date: Sun, 10 Apr 2011 22:06:36 -0400 Subject: ext4: Allow indirect-block file to grow the file size to max file size We can create 4402345721856 byte file with indirect block mapping. However, if we grow an indirect-block file to the size with ftruncate(), we can see an ext4 warning. The following patch fixes this problem. How to reproduce: # dd if=/dev/zero of=/mnt/mp1/hoge bs=1 count=0 seek=4402345721856 0+0 records in 0+0 records out 0 bytes (0 B) copied, 0.000221428 s, 0.0 kB/s # tail -n 1 /var/log/messages Nov 25 15:10:27 test kernel: EXT4-fs warning (device sda8): ext4_block_to_path:345: block 1074791436 > max in inode 12 Signed-off-by: Kazuya Mio Signed-off-by: "Theodore Ts'o" --- fs/ext4/inode.c | 23 +++++++++++++++++------ 1 file changed, 17 insertions(+), 6 deletions(-) (limited to 'fs/ext4/inode.c') diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c index 7d11e02ad01d..5560f78690ac 100644 --- a/fs/ext4/inode.c +++ b/fs/ext4/inode.c @@ -4429,8 +4429,8 @@ void ext4_truncate(struct inode *inode) Indirect chain[4]; Indirect *partial; __le32 nr = 0; - int n; - ext4_lblk_t last_block; + int n = 0; + ext4_lblk_t last_block, max_block; unsigned blocksize = inode->i_sb->s_blocksize; trace_ext4_truncate_enter(inode); @@ -4455,14 +4455,18 @@ void ext4_truncate(struct inode *inode) last_block = (inode->i_size + blocksize-1) >> EXT4_BLOCK_SIZE_BITS(inode->i_sb); + max_block = (EXT4_SB(inode->i_sb)->s_bitmap_maxbytes + blocksize-1) + >> EXT4_BLOCK_SIZE_BITS(inode->i_sb); if (inode->i_size & (blocksize - 1)) if (ext4_block_truncate_page(handle, mapping, inode->i_size)) goto out_stop; - n = ext4_block_to_path(inode, last_block, offsets, NULL); - if (n == 0) - goto out_stop; /* error */ + if (last_block != max_block) { + n = ext4_block_to_path(inode, last_block, offsets, NULL); + if (n == 0) + goto out_stop; /* error */ + } /* * OK. This truncate is going to happen. We add the inode to the @@ -4493,7 +4497,13 @@ void ext4_truncate(struct inode *inode) */ ei->i_disksize = inode->i_size; - if (n == 1) { /* direct blocks */ + if (last_block == max_block) { + /* + * It is unnecessary to free any data blocks if last_block is + * equal to the indirect block limit. + */ + goto out_unlock; + } else if (n == 1) { /* direct blocks */ ext4_free_data(handle, inode, NULL, i_data+offsets[0], i_data + EXT4_NDIR_BLOCKS); goto do_indirects; @@ -4553,6 +4563,7 @@ do_indirects: ; } +out_unlock: up_write(&ei->i_data_sem); inode->i_mtime = inode->i_ctime = ext4_current_time(inode); ext4_mark_inode_dirty(handle, inode); -- cgit v1.2.3 From c8205636029fc869278c55b7336053b3e7ae3ef4 Mon Sep 17 00:00:00 2001 From: Theodore Ts'o Date: Sun, 10 Apr 2011 22:30:07 -0400 Subject: ext4: fix data corruption regression by reverting commit 6de9843dab3f Revert commit 6de9843dab3f2a1d4d66d80aa9e5782f80977d20, since it caused a data corruption regression with BitTorrent downloads. Thanks to Damien for discovering and bisecting to find the problem commit. https://bugzilla.kernel.org/show_bug.cgi?id=32972 Reported-by: Damien Grassart Signed-off-by: "Theodore Ts'o" --- fs/ext4/inode.c | 1 + 1 file changed, 1 insertion(+) (limited to 'fs/ext4/inode.c') diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c index 5560f78690ac..9c8cf811d93a 100644 --- a/fs/ext4/inode.c +++ b/fs/ext4/inode.c @@ -2502,6 +2502,7 @@ static int ext4_da_get_block_prep(struct inode *inode, sector_t iblock, * for partial write. */ set_buffer_new(bh); + set_buffer_mapped(bh); } return 0; } -- cgit v1.2.3