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| author | Al Viro <viro@ZenIV.linux.org.uk> | 2015-09-09 10:16:39 +0100 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2015-09-09 10:43:12 -0700 |
| commit | bd2843fe1f29f6145c623ae9390f144cefaa611d (patch) | |
| tree | 78627367006fa23ea40a53adc0ddb6c528b43005 /fs/ufs | |
| parent | daf0e1ed578f65e8395102549e135887e6661860 (diff) | |
| download | lwn-bd2843fe1f29f6145c623ae9390f144cefaa611d.tar.gz lwn-bd2843fe1f29f6145c623ae9390f144cefaa611d.zip | |
fix ufs write vs readpage race when writing into a hole
Followup to the UFS series - with the way we clear the new blocks (via
buffer cache, possibly on more than a page worth of file) we really
should not insert a reference to new block into inode block tree until
after we'd cleared it.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/ufs')
| -rw-r--r-- | fs/ufs/balloc.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/fs/ufs/balloc.c b/fs/ufs/balloc.c index fb8b54eb77c5..dc5fae601c24 100644 --- a/fs/ufs/balloc.c +++ b/fs/ufs/balloc.c @@ -417,14 +417,14 @@ u64 ufs_new_fragments(struct inode *inode, void *p, u64 fragment, if (oldcount == 0) { result = ufs_alloc_fragments (inode, cgno, goal, count, err); if (result) { + ufs_clear_frags(inode, result + oldcount, + newcount - oldcount, locked_page != NULL); write_seqlock(&UFS_I(inode)->meta_lock); ufs_cpu_to_data_ptr(sb, p, result); write_sequnlock(&UFS_I(inode)->meta_lock); *err = 0; UFS_I(inode)->i_lastfrag = max(UFS_I(inode)->i_lastfrag, fragment + count); - ufs_clear_frags(inode, result + oldcount, - newcount - oldcount, locked_page != NULL); } mutex_unlock(&UFS_SB(sb)->s_lock); UFSD("EXIT, result %llu\n", (unsigned long long)result); |