diff options
Diffstat (limited to 'fs/xfs/xfs_aops.c')
| -rw-r--r-- | fs/xfs/xfs_aops.c | 37 |
1 files changed, 28 insertions, 9 deletions
diff --git a/fs/xfs/xfs_aops.c b/fs/xfs/xfs_aops.c index 29e7e5dd5178..da72090b9ce7 100644 --- a/fs/xfs/xfs_aops.c +++ b/fs/xfs/xfs_aops.c @@ -288,7 +288,7 @@ xfs_map_blocks( { struct xfs_inode *ip = XFS_I(inode); struct xfs_mount *mp = ip->i_mount; - ssize_t count = 1 << inode->i_blkbits; + ssize_t count = i_blocksize(inode); xfs_fileoff_t offset_fsb, end_fsb; int error = 0; int bmapi_flags = XFS_BMAPI_ENTIRE; @@ -310,7 +310,7 @@ xfs_map_blocks( (ip->i_df.if_flags & XFS_IFEXTENTS)); ASSERT(offset <= mp->m_super->s_maxbytes); - if (offset + count > mp->m_super->s_maxbytes) + if ((xfs_ufsize_t)offset + count > mp->m_super->s_maxbytes) count = mp->m_super->s_maxbytes - offset; end_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)offset + count); offset_fsb = XFS_B_TO_FSBT(mp, offset); @@ -921,7 +921,7 @@ xfs_aops_discard_page( break; } next_buffer: - offset += 1 << inode->i_blkbits; + offset += i_blocksize(inode); } while ((bh = bh->b_this_page) != head); @@ -1360,10 +1360,10 @@ xfs_map_trim_size( if (mapping_size > size) mapping_size = size; if (offset < i_size_read(inode) && - offset + mapping_size >= i_size_read(inode)) { + (xfs_ufsize_t)offset + mapping_size >= i_size_read(inode)) { /* limit mapping to block that spans EOF */ mapping_size = roundup_64(i_size_read(inode) - offset, - 1 << inode->i_blkbits); + i_blocksize(inode)); } if (mapping_size > LONG_MAX) mapping_size = LONG_MAX; @@ -1395,7 +1395,7 @@ __xfs_get_blocks( return -EIO; offset = (xfs_off_t)iblock << inode->i_blkbits; - ASSERT(bh_result->b_size >= (1 << inode->i_blkbits)); + ASSERT(bh_result->b_size >= i_blocksize(inode)); size = bh_result->b_size; if (!create && direct && offset >= i_size_read(inode)) @@ -1416,7 +1416,7 @@ __xfs_get_blocks( } ASSERT(offset <= mp->m_super->s_maxbytes); - if (offset + size > mp->m_super->s_maxbytes) + if ((xfs_ufsize_t)offset + size > mp->m_super->s_maxbytes) size = mp->m_super->s_maxbytes - offset; end_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)offset + size); offset_fsb = XFS_B_TO_FSBT(mp, offset); @@ -1426,6 +1426,26 @@ __xfs_get_blocks( if (error) goto out_unlock; + /* + * The only time we can ever safely find delalloc blocks on direct I/O + * is a dio write to post-eof speculative preallocation. All other + * scenarios are indicative of a problem or misuse (such as mixing + * direct and mapped I/O). + * + * The file may be unmapped by the time we get here so we cannot + * reliably fail the I/O based on mapping. Instead, fail the I/O if this + * is a read or a write within eof. Otherwise, carry on but warn as a + * precuation if the file happens to be mapped. + */ + if (direct && imap.br_startblock == DELAYSTARTBLOCK) { + if (!create || offset < i_size_read(VFS_I(ip))) { + WARN_ON_ONCE(1); + error = -EIO; + goto out_unlock; + } + WARN_ON_ONCE(mapping_mapped(VFS_I(ip)->i_mapping)); + } + /* for DAX, we convert unwritten extents directly */ if (create && (!nimaps || @@ -1525,7 +1545,6 @@ __xfs_get_blocks( set_buffer_new(bh_result); if (imap.br_startblock == DELAYSTARTBLOCK) { - BUG_ON(direct); if (create) { set_buffer_uptodate(bh_result); set_buffer_mapped(bh_result); @@ -1968,7 +1987,7 @@ xfs_vm_set_page_dirty( if (offset < end_offset) set_buffer_dirty(bh); bh = bh->b_this_page; - offset += 1 << inode->i_blkbits; + offset += i_blocksize(inode); } while (bh != head); } /* |