xfs_dir2_block_tail_t *
xfs_dir2_block_tail_p(xfs_mount_t *mp, xfs_dir2_block_t *block)
{
return XFS_DIR2_BLOCK_TAIL_P(mp, block);
}
/*
* Convert a block format directory to shortform.
* Caller has already checked that it will fit, and built us a header.
*/
int /* error */
xfs_dir2_block_to_sf(
xfs_da_args_t *args, /* operation arguments */
xfs_dabuf_t *bp, /* block buffer */
int size, /* shortform directory size */
xfs_dir2_sf_hdr_t *sfhp) /* shortform directory hdr */
{
xfs_dir2_block_t *block; /* block structure */
xfs_dir2_block_tail_t *btp; /* block tail pointer */
xfs_dir2_data_entry_t *dep; /* data entry pointer */
xfs_inode_t *dp; /* incore directory inode */
xfs_dir2_data_unused_t *dup; /* unused data pointer */
char *endptr; /* end of data entries */
int error; /* error return value */
int logflags; /* inode logging flags */
xfs_mount_t *mp; /* filesystem mount point */
char *ptr; /* current data pointer */
xfs_dir2_sf_entry_t *sfep; /* shortform entry */
xfs_dir2_sf_t *sfp; /* shortform structure */
xfs_ino_t temp;
xfs_dir2_trace_args_sb("block_to_sf", args, size, bp);
dp = args->dp;
mp = dp->i_mount;
/*
* Make a copy of the block data, so we can shrink the inode
* and add local data.
*/
block = kmem_alloc(mp->m_dirblksize, KM_SLEEP);
memcpy(block, bp->data, mp->m_dirblksize);
logflags = XFS_ILOG_CORE;
if ((error = xfs_dir2_shrink_inode(args, mp->m_dirdatablk, bp))) {
ASSERT(error != ENOSPC);
goto out;
}
/*
* The buffer is now unconditionally gone, whether
* xfs_dir2_shrink_inode worked or not.
*
* Convert the inode to local format.
*/
dp->i_df.if_flags &= ~XFS_IFEXTENTS;
dp->i_df.if_flags |= XFS_IFINLINE;
dp->i_d.di_format = XFS_DINODE_FMT_LOCAL;
ASSERT(dp->i_df.if_bytes == 0);
xfs_idata_realloc(dp, size, XFS_DATA_FORK);
logflags |= XFS_ILOG_DDATA;
/*
* Copy the header into the newly allocate local space.
*/
sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data;
memcpy(sfp, sfhp, XFS_DIR2_SF_HDR_SIZE(sfhp->i8count));
dp->i_d.di_size = size;
/*
* Set up to loop over the block's entries.
*/
btp = XFS_DIR2_BLOCK_TAIL_P(mp, block);
ptr = (char *)block->u;
endptr = (char *)XFS_DIR2_BLOCK_LEAF_P(btp);
sfep = XFS_DIR2_SF_FIRSTENTRY(sfp);
/*
* Loop over the active and unused entries.
* Stop when we reach the leaf/tail portion of the block.
*/
while (ptr < endptr) {
/*
* If it's unused, just skip over it.
*/
dup = (xfs_dir2_data_unused_t *)ptr;
if (INT_GET(dup->freetag, ARCH_CONVERT) == XFS_DIR2_DATA_FREE_TAG) {
ptr += INT_GET(dup->length, ARCH_CONVERT);
continue;
}
dep = (xfs_dir2_data_entry_t *)ptr;
/*
* Skip .
*/
if (dep->namelen == 1 && dep->name[0] == '.')
ASSERT(INT_GET(dep->inumber, ARCH_CONVERT) == dp->i_ino);
/*
* Skip .., but make sure the inode number is right.
*/
else if (dep->namelen == 2 &&
dep->name[0] == '.' && dep->name[1] == '.')
ASSERT(INT_GET(dep->inumber, ARCH_CONVERT) ==
XFS_DIR2_SF_GET_INUMBER(sfp, &sfp->hdr.parent));
/*
* Normal entry, copy it into shortform.
*/
else {
sfep->namelen = dep->namelen;
XFS_DIR2_SF_PUT_OFFSET(sfep,
(xfs_dir2_data_aoff_t)
((char *)dep - (char *)block));
memcpy(sfep->name, dep->name, dep->namelen);
temp=INT_GET(dep->inumber, ARCH_CONVERT);
XFS_DIR2_SF_PUT_INUMBER(sfp, &temp,
XFS_DIR2_SF_INUMBERP(sfep));
sfep = XFS_DIR2_SF_NEXTENTRY(sfp, sfep);
}
ptr += XFS_DIR2_DATA_ENTSIZE(dep->namelen);
}
ASSERT((char *)sfep - (char *)sfp == size);
xfs_dir2_sf_check(args);
out:
xfs_trans_log_inode(args->trans, dp, logflags);
kmem_free(block, mp->m_dirblksize);
return error;
}
/*
* 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;
}
/*
* 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;
}