From 9f6c92b9cc2fd41d6c7b493be5637cc5b5659880 Mon Sep 17 00:00:00 2001 From: Lachlan McIlroy Date: Mon, 22 Dec 2008 17:56:49 +1100 Subject: [PATCH] [XFS] Fix speculative allocation beyond eof Speculative allocation beyond eof doesn't work properly. It was broken some time ago after a code cleanup that moved what is now xfs_iomap_eof_align_last_fsb() and xfs_iomap_eof_want_preallocate() out of xfs_iomap_write_delay() into separate functions. The code used to use the current file size in various checks but got changed to be max(file_size, i_new_size). Since i_new_size is the result of 'offset + count' then in xfs_iomap_eof_want_preallocate() the check for '(offset + count) <= isize' will always be true. ie if 'offset + count' is > ip->i_size then isize will be i_new_size and equal to 'offset + count'. This change fixes all the places that used to use the current file size. Reviewed-by: Christoph Hellwig Signed-off-by: Lachlan McIlroy --- fs/xfs/xfs_iomap.c | 28 +++++++--------------------- 1 file changed, 7 insertions(+), 21 deletions(-) diff --git a/fs/xfs/xfs_iomap.c b/fs/xfs/xfs_iomap.c index 67f22b2..911062c 100644 --- a/fs/xfs/xfs_iomap.c +++ b/fs/xfs/xfs_iomap.c @@ -290,7 +290,6 @@ STATIC int xfs_iomap_eof_align_last_fsb( xfs_mount_t *mp, xfs_inode_t *ip, - xfs_fsize_t isize, xfs_extlen_t extsize, xfs_fileoff_t *last_fsb) { @@ -306,14 +305,14 @@ xfs_iomap_eof_align_last_fsb( * stripe width and we are allocating past the allocation eof. */ else if (mp->m_swidth && (mp->m_flags & XFS_MOUNT_SWALLOC) && - (isize >= XFS_FSB_TO_B(mp, mp->m_swidth))) + (ip->i_size >= XFS_FSB_TO_B(mp, mp->m_swidth))) new_last_fsb = roundup_64(*last_fsb, mp->m_swidth); /* * Roundup the allocation request to a stripe unit (m_dalign) boundary * if the file size is >= stripe unit size, and we are allocating past * the allocation eof. */ - else if (mp->m_dalign && (isize >= XFS_FSB_TO_B(mp, mp->m_dalign))) + else if (mp->m_dalign && (ip->i_size >= XFS_FSB_TO_B(mp, mp->m_dalign))) new_last_fsb = roundup_64(*last_fsb, mp->m_dalign); /* @@ -403,7 +402,6 @@ xfs_iomap_write_direct( xfs_filblks_t count_fsb, resaligned; xfs_fsblock_t firstfsb; xfs_extlen_t extsz, temp; - xfs_fsize_t isize; int nimaps; int bmapi_flag; int quota_flag; @@ -426,15 +424,10 @@ xfs_iomap_write_direct( rt = XFS_IS_REALTIME_INODE(ip); extsz = xfs_get_extsz_hint(ip); - isize = ip->i_size; - if (ip->i_new_size > isize) - isize = ip->i_new_size; - offset_fsb = XFS_B_TO_FSBT(mp, offset); last_fsb = XFS_B_TO_FSB(mp, ((xfs_ufsize_t)(offset + count))); - if ((offset + count) > isize) { - error = xfs_iomap_eof_align_last_fsb(mp, ip, isize, extsz, - &last_fsb); + if ((offset + count) > ip->i_size) { + error = xfs_iomap_eof_align_last_fsb(mp, ip, extsz, &last_fsb); if (error) goto error_out; } else { @@ -559,7 +552,6 @@ STATIC int xfs_iomap_eof_want_preallocate( xfs_mount_t *mp, xfs_inode_t *ip, - xfs_fsize_t isize, xfs_off_t offset, size_t count, int ioflag, @@ -573,7 +565,7 @@ xfs_iomap_eof_want_preallocate( int n, error, imaps; *prealloc = 0; - if ((ioflag & BMAPI_SYNC) || (offset + count) <= isize) + if ((ioflag & BMAPI_SYNC) || (offset + count) <= ip->i_size) return 0; /* @@ -617,7 +609,6 @@ xfs_iomap_write_delay( xfs_fileoff_t ioalign; xfs_fsblock_t firstblock; xfs_extlen_t extsz; - xfs_fsize_t isize; int nimaps; xfs_bmbt_irec_t imap[XFS_WRITE_IMAPS]; int prealloc, fsynced = 0; @@ -637,11 +628,7 @@ xfs_iomap_write_delay( offset_fsb = XFS_B_TO_FSBT(mp, offset); retry: - isize = ip->i_size; - if (ip->i_new_size > isize) - isize = ip->i_new_size; - - error = xfs_iomap_eof_want_preallocate(mp, ip, isize, offset, count, + error = xfs_iomap_eof_want_preallocate(mp, ip, offset, count, ioflag, imap, XFS_WRITE_IMAPS, &prealloc); if (error) return error; @@ -655,8 +642,7 @@ retry: } if (prealloc || extsz) { - error = xfs_iomap_eof_align_last_fsb(mp, ip, isize, extsz, - &last_fsb); + error = xfs_iomap_eof_align_last_fsb(mp, ip, extsz, &last_fsb); if (error) return error; } -- 2.7.4