From 0924b585fc49bf371bc700c23e516a538bf589af Mon Sep 17 00:00:00 2001 From: Dave Chinner Date: Fri, 28 Nov 2008 14:23:34 +1100 Subject: [XFS] fix uninitialised variable bug in dquot release. gcc is warning about an uninitialised variable in xfs_growfs_rt(). This is a false positive. Fix it by changing the scope of the transaction pointer to wholly within the internal loop inside the function. While there, preemptively change xfs_growfs_rt_alloc() in the same way as it has exactly the same structure as xfs_growfs_rt() but gcc is not warning about it. Yet. Signed-off-by: Dave Chinner Reviewed-by: Christoph Hellwig Signed-off-by: Niv Sardi --- fs/xfs/xfs_rtalloc.c | 39 ++++++++++++++++++--------------------- 1 file changed, 18 insertions(+), 21 deletions(-) (limited to 'fs/xfs/xfs_rtalloc.c') diff --git a/fs/xfs/xfs_rtalloc.c b/fs/xfs/xfs_rtalloc.c index e2f68de16159..f18b9b281799 100644 --- a/fs/xfs/xfs_rtalloc.c +++ b/fs/xfs/xfs_rtalloc.c @@ -85,7 +85,6 @@ xfs_growfs_rt_alloc( { xfs_fileoff_t bno; /* block number in file */ xfs_buf_t *bp; /* temporary buffer for zeroing */ - int cancelflags; /* flags for xfs_trans_cancel */ int committed; /* transaction committed flag */ xfs_daddr_t d; /* disk block address */ int error; /* error return value */ @@ -96,15 +95,16 @@ xfs_growfs_rt_alloc( xfs_bmbt_irec_t map; /* block map output */ int nmap; /* number of block maps */ int resblks; /* space reservation */ - xfs_trans_t *tp; /* transaction pointer */ /* * Allocate space to the file, as necessary. */ while (oblocks < nblocks) { + int cancelflags = 0; + xfs_trans_t *tp; + tp = xfs_trans_alloc(mp, XFS_TRANS_GROWFSRT_ALLOC); resblks = XFS_GROWFSRT_SPACE_RES(mp, nblocks - oblocks); - cancelflags = 0; /* * Reserve space & log for one extent added to the file. */ @@ -171,7 +171,9 @@ xfs_growfs_rt_alloc( mp->m_bsize, 0); if (bp == NULL) { error = XFS_ERROR(EIO); - goto error_cancel; +error_cancel: + xfs_trans_cancel(tp, cancelflags); + goto error; } memset(XFS_BUF_PTR(bp), 0, mp->m_sb.sb_blocksize); xfs_trans_log_buf(tp, bp, 0, mp->m_sb.sb_blocksize - 1); @@ -188,8 +190,6 @@ xfs_growfs_rt_alloc( oblocks = map.br_startoff + map.br_blockcount; } return 0; -error_cancel: - xfs_trans_cancel(tp, cancelflags); error: return error; } @@ -1856,7 +1856,6 @@ xfs_growfs_rt( { xfs_rtblock_t bmbno; /* bitmap block number */ xfs_buf_t *bp; /* temporary buffer */ - int cancelflags; /* flags for xfs_trans_cancel */ int error; /* error return value */ xfs_inode_t *ip; /* bitmap inode, used as lock */ xfs_mount_t *nmp; /* new (fake) mount structure */ @@ -1872,10 +1871,8 @@ xfs_growfs_rt( xfs_extlen_t rsumblocks; /* current number of rt summary blks */ xfs_sb_t *sbp; /* old superblock */ xfs_fsblock_t sumbno; /* summary block number */ - xfs_trans_t *tp; /* transaction pointer */ sbp = &mp->m_sb; - cancelflags = 0; /* * Initial error checking. */ @@ -1942,6 +1939,9 @@ xfs_growfs_rt( ((sbp->sb_rextents & ((1 << mp->m_blkbit_log) - 1)) != 0); bmbno < nrbmblocks; bmbno++) { + xfs_trans_t *tp; + int cancelflags = 0; + *nmp = *mp; nsbp = &nmp->m_sb; /* @@ -1967,16 +1967,15 @@ xfs_growfs_rt( * Start a transaction, get the log reservation. */ tp = xfs_trans_alloc(mp, XFS_TRANS_GROWFSRT_FREE); - cancelflags = 0; if ((error = xfs_trans_reserve(tp, 0, XFS_GROWRTFREE_LOG_RES(nmp), 0, 0, 0))) - break; + goto error_cancel; /* * Lock out other callers by grabbing the bitmap inode lock. */ if ((error = xfs_trans_iget(mp, tp, mp->m_sb.sb_rbmino, 0, XFS_ILOCK_EXCL, &ip))) - break; + goto error_cancel; ASSERT(ip == mp->m_rbmip); /* * Update the bitmap inode's size. @@ -1990,7 +1989,7 @@ xfs_growfs_rt( */ if ((error = xfs_trans_iget(mp, tp, mp->m_sb.sb_rsumino, 0, XFS_ILOCK_EXCL, &ip))) - break; + goto error_cancel; ASSERT(ip == mp->m_rsumip); /* * Update the summary inode's size. @@ -2005,7 +2004,7 @@ xfs_growfs_rt( mp->m_rsumlevels != nmp->m_rsumlevels) { error = xfs_rtcopy_summary(mp, nmp, tp); if (error) - break; + goto error_cancel; } /* * Update superblock fields. @@ -2031,8 +2030,11 @@ xfs_growfs_rt( bp = NULL; error = xfs_rtfree_range(nmp, tp, sbp->sb_rextents, nsbp->sb_rextents - sbp->sb_rextents, &bp, &sumbno); - if (error) + if (error) { +error_cancel: + xfs_trans_cancel(tp, cancelflags); break; + } /* * Mark more blocks free in the superblock. */ @@ -2045,15 +2047,10 @@ xfs_growfs_rt( mp->m_rsumsize = nrsumsize; error = xfs_trans_commit(tp, 0); - if (error) { - tp = NULL; + if (error) break; - } } - if (error && tp) - xfs_trans_cancel(tp, cancelflags); - /* * Free the fake mp structure. */ -- cgit v1.2.3 From 743bb4650da9e2595d6cedd01c680b5b9398c74a Mon Sep 17 00:00:00 2001 From: "sandeen@sandeen.net" Date: Tue, 25 Nov 2008 21:20:06 -0600 Subject: [XFS] Move copy_from_user calls out of ioctl helpers into ioctl switch. Moving the copy_from_user out of some of the ioctl helpers will make it easier for the compat ioctl switch to copy in the right struct, then just pass to the underlying helper. Also, move common access checks into the helpers themselves, and out of the native ioctl switch code, to reduce code duplication between native & compat ioctl callers. Signed-off-by: Eric Sandeen Reviewed-by: Christoph Hellwig Signed-off-by: Lachlan McIlroy --- fs/xfs/xfs_rtalloc.c | 2 ++ 1 file changed, 2 insertions(+) (limited to 'fs/xfs/xfs_rtalloc.c') diff --git a/fs/xfs/xfs_rtalloc.c b/fs/xfs/xfs_rtalloc.c index f18b9b281799..edf12c7b834c 100644 --- a/fs/xfs/xfs_rtalloc.c +++ b/fs/xfs/xfs_rtalloc.c @@ -1876,6 +1876,8 @@ xfs_growfs_rt( /* * Initial error checking. */ + if (!capable(CAP_SYS_ADMIN)) + return XFS_ERROR(EPERM); if (mp->m_rtdev_targp == NULL || mp->m_rbmip == NULL || (nrblocks = in->newblocks) <= sbp->sb_rblocks || (sbp->sb_rblocks && (in->extsize != sbp->sb_rextsize))) -- cgit v1.2.3