diff options
| author | Nathan Scott <nathans@sgi.com> | 2005-11-02 05:13:13 +0100 |
|---|---|---|
| committer | Nathan Scott <nathans@sgi.com> | 2005-11-02 05:13:13 +0100 |
| commit | fdc7ed75c08d507aa64c603b8bb7ef478dcc0000 (patch) | |
| tree | 7c27deb1d7d1490e3b7981451ac7bed43a7699c2 | |
| parent | [XFS] Remove an unhelpful ifdef, the comment above the routine explains (diff) | |
| download | linux-fdc7ed75c08d507aa64c603b8bb7ef478dcc0000.tar.xz linux-fdc7ed75c08d507aa64c603b8bb7ef478dcc0000.zip | |
[XFS] Fix boundary conditions when issuing direct IOs from large userspace
buffers.
SGI-PV: 944820
SGI-Modid: xfs-linux:xfs-kern:24223a
Signed-off-by: Nathan Scott <nathans@sgi.com>
| -rw-r--r-- | fs/xfs/linux-2.6/xfs_aops.c | 28 |
1 files changed, 16 insertions, 12 deletions
diff --git a/fs/xfs/linux-2.6/xfs_aops.c b/fs/xfs/linux-2.6/xfs_aops.c index 26c346d9de51..1f38b528f0bd 100644 --- a/fs/xfs/linux-2.6/xfs_aops.c +++ b/fs/xfs/linux-2.6/xfs_aops.c @@ -935,15 +935,18 @@ __linvfs_get_block( { vnode_t *vp = LINVFS_GET_VP(inode); xfs_iomap_t iomap; + xfs_off_t offset; + ssize_t size; int retpbbm = 1; int error; - ssize_t size; - loff_t offset = (loff_t)iblock << inode->i_blkbits; - if (blocks) - size = blocks << inode->i_blkbits; - else + if (blocks) { + offset = blocks << inode->i_blkbits; /* 64 bit goodness */ + size = (ssize_t) min_t(xfs_off_t, offset, LONG_MAX); + } else { size = 1 << inode->i_blkbits; + } + offset = (xfs_off_t)iblock << inode->i_blkbits; VOP_BMAP(vp, offset, size, create ? flags : BMAPI_READ, &iomap, &retpbbm, error); @@ -954,8 +957,8 @@ __linvfs_get_block( return 0; if (iomap.iomap_bn != IOMAP_DADDR_NULL) { - xfs_daddr_t bn; - loff_t delta; + xfs_daddr_t bn; + xfs_off_t delta; /* For unwritten extents do not report a disk address on * the read case (treat as if we're reading into a hole). @@ -987,9 +990,8 @@ __linvfs_get_block( */ if (create && ((!buffer_mapped(bh_result) && !buffer_uptodate(bh_result)) || - (offset >= i_size_read(inode)) || (iomap.iomap_flags & IOMAP_NEW))) { + (offset >= i_size_read(inode)) || (iomap.iomap_flags & IOMAP_NEW))) set_buffer_new(bh_result); - } if (iomap.iomap_flags & IOMAP_DELAY) { BUG_ON(direct); @@ -1001,9 +1003,11 @@ __linvfs_get_block( } if (blocks) { - bh_result->b_size = (ssize_t)min( - (loff_t)(iomap.iomap_bsize - iomap.iomap_delta), - (loff_t)(blocks << inode->i_blkbits)); + ASSERT(iomap.iomap_bsize - iomap.iomap_delta > 0); + offset = min_t(xfs_off_t, + iomap.iomap_bsize - iomap.iomap_delta, + blocks << inode->i_blkbits); + bh_result->b_size = (u32) min_t(xfs_off_t, UINT_MAX, offset); } return 0; |