/* * Given a block directory (dp/block), calculate its size as a shortform (sf) * directory and a header for the sf directory, if it will fit it the * space currently present in the inode. If it won't fit, the output * size is too big (but not accurate). */ int /* size for sf form */ xfs_dir2_block_sfsize( xfs_inode_t *dp, /* incore inode pointer */ xfs_dir2_block_t *block, /* block directory data */ xfs_dir2_sf_hdr_t *sfhp) /* output: header for sf form */ { xfs_dir2_dataptr_t addr; /* data entry address */ xfs_dir2_leaf_entry_t *blp; /* leaf area of the block */ xfs_dir2_block_tail_t *btp; /* tail area of the block */ int count; /* shortform entry count */ xfs_dir2_data_entry_t *dep; /* data entry in the block */ int i; /* block entry index */ int i8count; /* count of big-inode entries */ int isdot; /* entry is "." */ int isdotdot; /* entry is ".." */ xfs_mount_t *mp; /* mount structure pointer */ int namelen; /* total name bytes */ xfs_ino_t parent = 0; /* parent inode number */ int size=0; /* total computed size */ mp = dp->i_mount; count = i8count = namelen = 0; btp = XFS_DIR2_BLOCK_TAIL_P(mp, block); blp = XFS_DIR2_BLOCK_LEAF_P(btp); /* * Iterate over the block's data entries by using the leaf pointers. */ for (i = 0; i < INT_GET(btp->count, ARCH_CONVERT); i++) { if ((addr = INT_GET(blp[i].address, ARCH_CONVERT)) == XFS_DIR2_NULL_DATAPTR) continue; /* * Calculate the pointer to the entry at hand. */ dep = (xfs_dir2_data_entry_t *) ((char *)block + XFS_DIR2_DATAPTR_TO_OFF(mp, addr)); /* * Detect . and .., so we can special-case them. * . is not included in sf directories. * .. is included by just the parent inode number. */ isdot = dep->namelen == 1 && dep->name[0] == '.'; isdotdot = dep->namelen == 2 && dep->name[0] == '.' && dep->name[1] == '.'; #if XFS_BIG_INUMS if (!isdot) i8count += INT_GET(dep->inumber, ARCH_CONVERT) > XFS_DIR2_MAX_SHORT_INUM; #endif if (!isdot && !isdotdot) { count++; namelen += dep->namelen; } else if (isdotdot) parent = INT_GET(dep->inumber, ARCH_CONVERT); /* * Calculate the new size, see if we should give up yet. */ /* Add by Jerry 2007/10/25 Fixed bug that XFS file system corrupted under Winthrax test. This is the "special" structure alignment on the ARM. Port a workaround solution from a patch on http://lists.arm.linux.org.uk/pipermail/linux-arm-kernel/2004-March/020287.html and http://www.nas-central.org/index.php/Buffalo_ARM9_Kernel_Port#XFS_Arm_Issues This patch was never accepted by XFS because the code is incorrect for all other platforms. */ #if 0 size = XFS_DIR2_SF_HDR_SIZE(i8count) + /* header */ count + /* namelen */ count * (uint)sizeof(xfs_dir2_sf_off_t) + /* offset */ namelen + /* name */ (i8count ? /* inumber */ (uint)sizeof(xfs_dir2_ino8_t) * count : (uint)sizeof(xfs_dir2_ino4_t) * count); #else size = XFS_DIR2_SF_HDR_SIZE(i8count) /* header */ + namelen + (count * (sizeof(xfs_dir2_sf_entry_t) - 1)) - (count * (((i8count == 0) ? 1 : 0) * (sizeof(xfs_dir2_ino8_t) - sizeof(xfs_dir2_ino4_t)))); #endif if (size > XFS_IFORK_DSIZE(dp)) return size; /* size value is a failure */ } /* * Create the output header, if it worked. */ sfhp->count = count; sfhp->i8count = i8count; XFS_DIR2_SF_PUT_INUMBER((xfs_dir2_sf_t *)sfhp, &parent, &sfhp->parent); return size; }
xfs_dir2_data_aoff_t xfs_dir2_dataptr_to_off(xfs_mount_t *mp, xfs_dir2_dataptr_t dp) { return XFS_DIR2_DATAPTR_TO_OFF(mp, dp); }
/* * Given a block directory (dp/block), calculate its size as a shortform (sf) * directory and a header for the sf directory, if it will fit it the * space currently present in the inode. If it won't fit, the output * size is too big (but not accurate). */ int /* size for sf form */ xfs_dir2_block_sfsize( xfs_inode_t *dp, /* incore inode pointer */ xfs_dir2_block_t *block, /* block directory data */ xfs_dir2_sf_hdr_t *sfhp) /* output: header for sf form */ { xfs_dir2_dataptr_t addr; /* data entry address */ xfs_dir2_leaf_entry_t *blp; /* leaf area of the block */ xfs_dir2_block_tail_t *btp; /* tail area of the block */ int count; /* shortform entry count */ xfs_dir2_data_entry_t *dep; /* data entry in the block */ int i; /* block entry index */ int i8count; /* count of big-inode entries */ int isdot; /* entry is "." */ int isdotdot; /* entry is ".." */ xfs_mount_t *mp; /* mount structure pointer */ int namelen; /* total name bytes */ xfs_ino_t parent; /* parent inode number */ int size=0; /* total computed size */ mp = dp->i_mount; count = i8count = namelen = 0; btp = XFS_DIR2_BLOCK_TAIL_P(mp, block); blp = XFS_DIR2_BLOCK_LEAF_P(btp); /* * Iterate over the block's data entries by using the leaf pointers. */ for (i = 0; i < INT_GET(btp->count, ARCH_CONVERT); i++) { if ((addr = INT_GET(blp[i].address, ARCH_CONVERT)) == XFS_DIR2_NULL_DATAPTR) continue; /* * Calculate the pointer to the entry at hand. */ dep = (xfs_dir2_data_entry_t *) ((char *)block + XFS_DIR2_DATAPTR_TO_OFF(mp, addr)); /* * Detect . and .., so we can special-case them. * . is not included in sf directories. * .. is included by just the parent inode number. */ isdot = dep->namelen == 1 && dep->name[0] == '.'; isdotdot = dep->namelen == 2 && dep->name[0] == '.' && dep->name[1] == '.'; #if XFS_BIG_INUMS if (!isdot) i8count += INT_GET(dep->inumber, ARCH_CONVERT) > XFS_DIR2_MAX_SHORT_INUM; #endif if (!isdot && !isdotdot) { count++; namelen += dep->namelen; } else if (isdotdot) parent = INT_GET(dep->inumber, ARCH_CONVERT); /* * Calculate the new size, see if we should give up yet. */ size = XFS_DIR2_SF_HDR_SIZE(i8count) + /* header */ count + /* namelen */ count * (uint)sizeof(xfs_dir2_sf_off_t) + /* offset */ namelen + /* name */ (i8count ? /* inumber */ (uint)sizeof(xfs_dir2_ino8_t) * count : (uint)sizeof(xfs_dir2_ino4_t) * count); if (size > XFS_IFORK_DSIZE(dp)) return size; /* size value is a failure */ } /* * Create the output header, if it worked. */ sfhp->count = count; sfhp->i8count = i8count; XFS_DIR2_SF_PUT_INUMBER((xfs_dir2_sf_t *)sfhp, &parent, &sfhp->parent); return size; }