linux-stable/fs/xfs/libxfs/xfs_dir2_sf.c
Dave Chinner 0b61f8a407 xfs: convert to SPDX license tags
Remove the verbose license text from XFS files and replace them
with SPDX tags. This does not change the license of any of the code,
merely refers to the common, up-to-date license files in LICENSES/

This change was mostly scripted. fs/xfs/Makefile and
fs/xfs/libxfs/xfs_fs.h were modified by hand, the rest were detected
and modified by the following command:

for f in `git grep -l "GNU General" fs/xfs/` ; do
	echo $f
	cat $f | awk -f hdr.awk > $f.new
	mv -f $f.new $f
done

And the hdr.awk script that did the modification (including
detecting the difference between GPL-2.0 and GPL-2.0+ licenses)
is as follows:

$ cat hdr.awk
BEGIN {
	hdr = 1.0
	tag = "GPL-2.0"
	str = ""
}

/^ \* This program is free software/ {
	hdr = 2.0;
	next
}

/any later version./ {
	tag = "GPL-2.0+"
	next
}

/^ \*\// {
	if (hdr > 0.0) {
		print "// SPDX-License-Identifier: " tag
		print str
		print $0
		str=""
		hdr = 0.0
		next
	}
	print $0
	next
}

/^ \* / {
	if (hdr > 1.0)
		next
	if (hdr > 0.0) {
		if (str != "")
			str = str "\n"
		str = str $0
		next
	}
	print $0
	next
}

/^ \*/ {
	if (hdr > 0.0)
		next
	print $0
	next
}

// {
	if (hdr > 0.0) {
		if (str != "")
			str = str "\n"
		str = str $0
		next
	}
	print $0
}

END { }
$

Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
2018-06-06 14:17:53 -07:00

1217 lines
35 KiB
C

// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (c) 2000-2003,2005 Silicon Graphics, Inc.
* All Rights Reserved.
*/
#include "xfs.h"
#include "xfs_fs.h"
#include "xfs_format.h"
#include "xfs_log_format.h"
#include "xfs_trans_resv.h"
#include "xfs_mount.h"
#include "xfs_da_format.h"
#include "xfs_da_btree.h"
#include "xfs_inode.h"
#include "xfs_trans.h"
#include "xfs_inode_item.h"
#include "xfs_error.h"
#include "xfs_dir2.h"
#include "xfs_dir2_priv.h"
#include "xfs_trace.h"
/*
* Prototypes for internal functions.
*/
static void xfs_dir2_sf_addname_easy(xfs_da_args_t *args,
xfs_dir2_sf_entry_t *sfep,
xfs_dir2_data_aoff_t offset,
int new_isize);
static void xfs_dir2_sf_addname_hard(xfs_da_args_t *args, int objchange,
int new_isize);
static int xfs_dir2_sf_addname_pick(xfs_da_args_t *args, int objchange,
xfs_dir2_sf_entry_t **sfepp,
xfs_dir2_data_aoff_t *offsetp);
#ifdef DEBUG
static void xfs_dir2_sf_check(xfs_da_args_t *args);
#else
#define xfs_dir2_sf_check(args)
#endif /* DEBUG */
static void xfs_dir2_sf_toino4(xfs_da_args_t *args);
static void xfs_dir2_sf_toino8(xfs_da_args_t *args);
/*
* 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_data_hdr_t *hdr, /* 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 */
int has_ftype;
struct xfs_da_geometry *geo;
mp = dp->i_mount;
geo = mp->m_dir_geo;
/*
* if there is a filetype field, add the extra byte to the namelen
* for each entry that we see.
*/
has_ftype = xfs_sb_version_hasftype(&mp->m_sb) ? 1 : 0;
count = i8count = namelen = 0;
btp = xfs_dir2_block_tail_p(geo, hdr);
blp = xfs_dir2_block_leaf_p(btp);
/*
* Iterate over the block's data entries by using the leaf pointers.
*/
for (i = 0; i < be32_to_cpu(btp->count); i++) {
if ((addr = be32_to_cpu(blp[i].address)) == XFS_DIR2_NULL_DATAPTR)
continue;
/*
* Calculate the pointer to the entry at hand.
*/
dep = (xfs_dir2_data_entry_t *)((char *)hdr +
xfs_dir2_dataptr_to_off(geo, 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 (!isdot)
i8count += be64_to_cpu(dep->inumber) > XFS_DIR2_MAX_SHORT_INUM;
/* take into account the file type field */
if (!isdot && !isdotdot) {
count++;
namelen += dep->namelen + has_ftype;
} else if (isdotdot)
parent = be64_to_cpu(dep->inumber);
/*
* Calculate the new size, see if we should give up yet.
*/
size = xfs_dir2_sf_hdr_size(i8count) + /* header */
count * 3 * sizeof(u8) + /* namelen + offset */
namelen + /* name */
(i8count ? /* inumber */
count * XFS_INO64_SIZE :
count * XFS_INO32_SIZE);
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;
dp->d_ops->sf_put_parent_ino(sfhp, parent);
return size;
}
/*
* 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 */
struct xfs_buf *bp,
int size, /* shortform directory size */
xfs_dir2_sf_hdr_t *sfhp) /* shortform directory hdr */
{
xfs_dir2_data_hdr_t *hdr; /* block header */
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_hdr_t *sfp; /* shortform directory header */
xfs_dir2_sf_hdr_t *dst; /* temporary data buffer */
trace_xfs_dir2_block_to_sf(args);
dp = args->dp;
mp = dp->i_mount;
/*
* allocate a temporary destination buffer the size of the inode
* to format the data into. Once we have formatted the data, we
* can free the block and copy the formatted data into the inode literal
* area.
*/
dst = kmem_alloc(mp->m_sb.sb_inodesize, KM_SLEEP);
hdr = bp->b_addr;
/*
* Copy the header into the newly allocate local space.
*/
sfp = (xfs_dir2_sf_hdr_t *)dst;
memcpy(sfp, sfhp, xfs_dir2_sf_hdr_size(sfhp->i8count));
/*
* Set up to loop over the block's entries.
*/
ptr = (char *)dp->d_ops->data_entry_p(hdr);
endptr = xfs_dir3_data_endp(args->geo, hdr);
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 (be16_to_cpu(dup->freetag) == XFS_DIR2_DATA_FREE_TAG) {
ptr += be16_to_cpu(dup->length);
continue;
}
dep = (xfs_dir2_data_entry_t *)ptr;
/*
* Skip .
*/
if (dep->namelen == 1 && dep->name[0] == '.')
ASSERT(be64_to_cpu(dep->inumber) == dp->i_ino);
/*
* Skip .., but make sure the inode number is right.
*/
else if (dep->namelen == 2 &&
dep->name[0] == '.' && dep->name[1] == '.')
ASSERT(be64_to_cpu(dep->inumber) ==
dp->d_ops->sf_get_parent_ino(sfp));
/*
* 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 *)hdr));
memcpy(sfep->name, dep->name, dep->namelen);
dp->d_ops->sf_put_ino(sfp, sfep,
be64_to_cpu(dep->inumber));
dp->d_ops->sf_put_ftype(sfep,
dp->d_ops->data_get_ftype(dep));
sfep = dp->d_ops->sf_nextentry(sfp, sfep);
}
ptr += dp->d_ops->data_entsize(dep->namelen);
}
ASSERT((char *)sfep - (char *)sfp == size);
/* now we are done with the block, we can shrink the inode */
logflags = XFS_ILOG_CORE;
error = xfs_dir2_shrink_inode(args, args->geo->datablk, bp);
if (error) {
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 and copy the data in.
*/
ASSERT(dp->i_df.if_bytes == 0);
xfs_init_local_fork(dp, XFS_DATA_FORK, dst, size);
dp->i_d.di_format = XFS_DINODE_FMT_LOCAL;
dp->i_d.di_size = size;
logflags |= XFS_ILOG_DDATA;
xfs_dir2_sf_check(args);
out:
xfs_trans_log_inode(args->trans, dp, logflags);
kmem_free(dst);
return error;
}
/*
* Add a name to a shortform directory.
* There are two algorithms, "easy" and "hard" which we decide on
* before changing anything.
* Convert to block form if necessary, if the new entry won't fit.
*/
int /* error */
xfs_dir2_sf_addname(
xfs_da_args_t *args) /* operation arguments */
{
xfs_inode_t *dp; /* incore directory inode */
int error; /* error return value */
int incr_isize; /* total change in size */
int new_isize; /* di_size after adding name */
int objchange; /* changing to 8-byte inodes */
xfs_dir2_data_aoff_t offset = 0; /* offset for new entry */
int pick; /* which algorithm to use */
xfs_dir2_sf_hdr_t *sfp; /* shortform structure */
xfs_dir2_sf_entry_t *sfep = NULL; /* shortform entry */
trace_xfs_dir2_sf_addname(args);
ASSERT(xfs_dir2_sf_lookup(args) == -ENOENT);
dp = args->dp;
ASSERT(dp->i_df.if_flags & XFS_IFINLINE);
/*
* Make sure the shortform value has some of its header.
*/
if (dp->i_d.di_size < offsetof(xfs_dir2_sf_hdr_t, parent)) {
ASSERT(XFS_FORCED_SHUTDOWN(dp->i_mount));
return -EIO;
}
ASSERT(dp->i_df.if_bytes == dp->i_d.di_size);
ASSERT(dp->i_df.if_u1.if_data != NULL);
sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
ASSERT(dp->i_d.di_size >= xfs_dir2_sf_hdr_size(sfp->i8count));
/*
* Compute entry (and change in) size.
*/
incr_isize = dp->d_ops->sf_entsize(sfp, args->namelen);
objchange = 0;
/*
* Do we have to change to 8 byte inodes?
*/
if (args->inumber > XFS_DIR2_MAX_SHORT_INUM && sfp->i8count == 0) {
/*
* Yes, adjust the inode size. old count + (parent + new)
*/
incr_isize += (sfp->count + 2) * XFS_INO64_DIFF;
objchange = 1;
}
new_isize = (int)dp->i_d.di_size + incr_isize;
/*
* Won't fit as shortform any more (due to size),
* or the pick routine says it won't (due to offset values).
*/
if (new_isize > XFS_IFORK_DSIZE(dp) ||
(pick =
xfs_dir2_sf_addname_pick(args, objchange, &sfep, &offset)) == 0) {
/*
* Just checking or no space reservation, it doesn't fit.
*/
if ((args->op_flags & XFS_DA_OP_JUSTCHECK) || args->total == 0)
return -ENOSPC;
/*
* Convert to block form then add the name.
*/
error = xfs_dir2_sf_to_block(args);
if (error)
return error;
return xfs_dir2_block_addname(args);
}
/*
* Just checking, it fits.
*/
if (args->op_flags & XFS_DA_OP_JUSTCHECK)
return 0;
/*
* Do it the easy way - just add it at the end.
*/
if (pick == 1)
xfs_dir2_sf_addname_easy(args, sfep, offset, new_isize);
/*
* Do it the hard way - look for a place to insert the new entry.
* Convert to 8 byte inode numbers first if necessary.
*/
else {
ASSERT(pick == 2);
if (objchange)
xfs_dir2_sf_toino8(args);
xfs_dir2_sf_addname_hard(args, objchange, new_isize);
}
xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE | XFS_ILOG_DDATA);
return 0;
}
/*
* Add the new entry the "easy" way.
* This is copying the old directory and adding the new entry at the end.
* Since it's sorted by "offset" we need room after the last offset
* that's already there, and then room to convert to a block directory.
* This is already checked by the pick routine.
*/
static void
xfs_dir2_sf_addname_easy(
xfs_da_args_t *args, /* operation arguments */
xfs_dir2_sf_entry_t *sfep, /* pointer to new entry */
xfs_dir2_data_aoff_t offset, /* offset to use for new ent */
int new_isize) /* new directory size */
{
int byteoff; /* byte offset in sf dir */
xfs_inode_t *dp; /* incore directory inode */
xfs_dir2_sf_hdr_t *sfp; /* shortform structure */
dp = args->dp;
sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
byteoff = (int)((char *)sfep - (char *)sfp);
/*
* Grow the in-inode space.
*/
xfs_idata_realloc(dp, dp->d_ops->sf_entsize(sfp, args->namelen),
XFS_DATA_FORK);
/*
* Need to set up again due to realloc of the inode data.
*/
sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
sfep = (xfs_dir2_sf_entry_t *)((char *)sfp + byteoff);
/*
* Fill in the new entry.
*/
sfep->namelen = args->namelen;
xfs_dir2_sf_put_offset(sfep, offset);
memcpy(sfep->name, args->name, sfep->namelen);
dp->d_ops->sf_put_ino(sfp, sfep, args->inumber);
dp->d_ops->sf_put_ftype(sfep, args->filetype);
/*
* Update the header and inode.
*/
sfp->count++;
if (args->inumber > XFS_DIR2_MAX_SHORT_INUM)
sfp->i8count++;
dp->i_d.di_size = new_isize;
xfs_dir2_sf_check(args);
}
/*
* Add the new entry the "hard" way.
* The caller has already converted to 8 byte inode numbers if necessary,
* in which case we need to leave the i8count at 1.
* Find a hole that the new entry will fit into, and copy
* the first part of the entries, the new entry, and the last part of
* the entries.
*/
/* ARGSUSED */
static void
xfs_dir2_sf_addname_hard(
xfs_da_args_t *args, /* operation arguments */
int objchange, /* changing inode number size */
int new_isize) /* new directory size */
{
int add_datasize; /* data size need for new ent */
char *buf; /* buffer for old */
xfs_inode_t *dp; /* incore directory inode */
int eof; /* reached end of old dir */
int nbytes; /* temp for byte copies */
xfs_dir2_data_aoff_t new_offset; /* next offset value */
xfs_dir2_data_aoff_t offset; /* current offset value */
int old_isize; /* previous di_size */
xfs_dir2_sf_entry_t *oldsfep; /* entry in original dir */
xfs_dir2_sf_hdr_t *oldsfp; /* original shortform dir */
xfs_dir2_sf_entry_t *sfep; /* entry in new dir */
xfs_dir2_sf_hdr_t *sfp; /* new shortform dir */
/*
* Copy the old directory to the stack buffer.
*/
dp = args->dp;
sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
old_isize = (int)dp->i_d.di_size;
buf = kmem_alloc(old_isize, KM_SLEEP);
oldsfp = (xfs_dir2_sf_hdr_t *)buf;
memcpy(oldsfp, sfp, old_isize);
/*
* Loop over the old directory finding the place we're going
* to insert the new entry.
* If it's going to end up at the end then oldsfep will point there.
*/
for (offset = dp->d_ops->data_first_offset,
oldsfep = xfs_dir2_sf_firstentry(oldsfp),
add_datasize = dp->d_ops->data_entsize(args->namelen),
eof = (char *)oldsfep == &buf[old_isize];
!eof;
offset = new_offset + dp->d_ops->data_entsize(oldsfep->namelen),
oldsfep = dp->d_ops->sf_nextentry(oldsfp, oldsfep),
eof = (char *)oldsfep == &buf[old_isize]) {
new_offset = xfs_dir2_sf_get_offset(oldsfep);
if (offset + add_datasize <= new_offset)
break;
}
/*
* Get rid of the old directory, then allocate space for
* the new one. We do this so xfs_idata_realloc won't copy
* the data.
*/
xfs_idata_realloc(dp, -old_isize, XFS_DATA_FORK);
xfs_idata_realloc(dp, new_isize, XFS_DATA_FORK);
/*
* Reset the pointer since the buffer was reallocated.
*/
sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
/*
* Copy the first part of the directory, including the header.
*/
nbytes = (int)((char *)oldsfep - (char *)oldsfp);
memcpy(sfp, oldsfp, nbytes);
sfep = (xfs_dir2_sf_entry_t *)((char *)sfp + nbytes);
/*
* Fill in the new entry, and update the header counts.
*/
sfep->namelen = args->namelen;
xfs_dir2_sf_put_offset(sfep, offset);
memcpy(sfep->name, args->name, sfep->namelen);
dp->d_ops->sf_put_ino(sfp, sfep, args->inumber);
dp->d_ops->sf_put_ftype(sfep, args->filetype);
sfp->count++;
if (args->inumber > XFS_DIR2_MAX_SHORT_INUM && !objchange)
sfp->i8count++;
/*
* If there's more left to copy, do that.
*/
if (!eof) {
sfep = dp->d_ops->sf_nextentry(sfp, sfep);
memcpy(sfep, oldsfep, old_isize - nbytes);
}
kmem_free(buf);
dp->i_d.di_size = new_isize;
xfs_dir2_sf_check(args);
}
/*
* Decide if the new entry will fit at all.
* If it will fit, pick between adding the new entry to the end (easy)
* or somewhere else (hard).
* Return 0 (won't fit), 1 (easy), 2 (hard).
*/
/*ARGSUSED*/
static int /* pick result */
xfs_dir2_sf_addname_pick(
xfs_da_args_t *args, /* operation arguments */
int objchange, /* inode # size changes */
xfs_dir2_sf_entry_t **sfepp, /* out(1): new entry ptr */
xfs_dir2_data_aoff_t *offsetp) /* out(1): new offset */
{
xfs_inode_t *dp; /* incore directory inode */
int holefit; /* found hole it will fit in */
int i; /* entry number */
xfs_dir2_data_aoff_t offset; /* data block offset */
xfs_dir2_sf_entry_t *sfep; /* shortform entry */
xfs_dir2_sf_hdr_t *sfp; /* shortform structure */
int size; /* entry's data size */
int used; /* data bytes used */
dp = args->dp;
sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
size = dp->d_ops->data_entsize(args->namelen);
offset = dp->d_ops->data_first_offset;
sfep = xfs_dir2_sf_firstentry(sfp);
holefit = 0;
/*
* Loop over sf entries.
* Keep track of data offset and whether we've seen a place
* to insert the new entry.
*/
for (i = 0; i < sfp->count; i++) {
if (!holefit)
holefit = offset + size <= xfs_dir2_sf_get_offset(sfep);
offset = xfs_dir2_sf_get_offset(sfep) +
dp->d_ops->data_entsize(sfep->namelen);
sfep = dp->d_ops->sf_nextentry(sfp, sfep);
}
/*
* Calculate data bytes used excluding the new entry, if this
* was a data block (block form directory).
*/
used = offset +
(sfp->count + 3) * (uint)sizeof(xfs_dir2_leaf_entry_t) +
(uint)sizeof(xfs_dir2_block_tail_t);
/*
* If it won't fit in a block form then we can't insert it,
* we'll go back, convert to block, then try the insert and convert
* to leaf.
*/
if (used + (holefit ? 0 : size) > args->geo->blksize)
return 0;
/*
* If changing the inode number size, do it the hard way.
*/
if (objchange)
return 2;
/*
* If it won't fit at the end then do it the hard way (use the hole).
*/
if (used + size > args->geo->blksize)
return 2;
/*
* Do it the easy way.
*/
*sfepp = sfep;
*offsetp = offset;
return 1;
}
#ifdef DEBUG
/*
* Check consistency of shortform directory, assert if bad.
*/
static void
xfs_dir2_sf_check(
xfs_da_args_t *args) /* operation arguments */
{
xfs_inode_t *dp; /* incore directory inode */
int i; /* entry number */
int i8count; /* number of big inode#s */
xfs_ino_t ino; /* entry inode number */
int offset; /* data offset */
xfs_dir2_sf_entry_t *sfep; /* shortform dir entry */
xfs_dir2_sf_hdr_t *sfp; /* shortform structure */
dp = args->dp;
sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
offset = dp->d_ops->data_first_offset;
ino = dp->d_ops->sf_get_parent_ino(sfp);
i8count = ino > XFS_DIR2_MAX_SHORT_INUM;
for (i = 0, sfep = xfs_dir2_sf_firstentry(sfp);
i < sfp->count;
i++, sfep = dp->d_ops->sf_nextentry(sfp, sfep)) {
ASSERT(xfs_dir2_sf_get_offset(sfep) >= offset);
ino = dp->d_ops->sf_get_ino(sfp, sfep);
i8count += ino > XFS_DIR2_MAX_SHORT_INUM;
offset =
xfs_dir2_sf_get_offset(sfep) +
dp->d_ops->data_entsize(sfep->namelen);
ASSERT(dp->d_ops->sf_get_ftype(sfep) < XFS_DIR3_FT_MAX);
}
ASSERT(i8count == sfp->i8count);
ASSERT((char *)sfep - (char *)sfp == dp->i_d.di_size);
ASSERT(offset +
(sfp->count + 2) * (uint)sizeof(xfs_dir2_leaf_entry_t) +
(uint)sizeof(xfs_dir2_block_tail_t) <= args->geo->blksize);
}
#endif /* DEBUG */
/* Verify the consistency of an inline directory. */
xfs_failaddr_t
xfs_dir2_sf_verify(
struct xfs_inode *ip)
{
struct xfs_mount *mp = ip->i_mount;
struct xfs_dir2_sf_hdr *sfp;
struct xfs_dir2_sf_entry *sfep;
struct xfs_dir2_sf_entry *next_sfep;
char *endp;
const struct xfs_dir_ops *dops;
struct xfs_ifork *ifp;
xfs_ino_t ino;
int i;
int i8count;
int offset;
int size;
int error;
uint8_t filetype;
ASSERT(ip->i_d.di_format == XFS_DINODE_FMT_LOCAL);
/*
* xfs_iread calls us before xfs_setup_inode sets up ip->d_ops,
* so we can only trust the mountpoint to have the right pointer.
*/
dops = xfs_dir_get_ops(mp, NULL);
ifp = XFS_IFORK_PTR(ip, XFS_DATA_FORK);
sfp = (struct xfs_dir2_sf_hdr *)ifp->if_u1.if_data;
size = ifp->if_bytes;
/*
* Give up if the directory is way too short.
*/
if (size <= offsetof(struct xfs_dir2_sf_hdr, parent) ||
size < xfs_dir2_sf_hdr_size(sfp->i8count))
return __this_address;
endp = (char *)sfp + size;
/* Check .. entry */
ino = dops->sf_get_parent_ino(sfp);
i8count = ino > XFS_DIR2_MAX_SHORT_INUM;
error = xfs_dir_ino_validate(mp, ino);
if (error)
return __this_address;
offset = dops->data_first_offset;
/* Check all reported entries */
sfep = xfs_dir2_sf_firstentry(sfp);
for (i = 0; i < sfp->count; i++) {
/*
* struct xfs_dir2_sf_entry has a variable length.
* Check the fixed-offset parts of the structure are
* within the data buffer.
*/
if (((char *)sfep + sizeof(*sfep)) >= endp)
return __this_address;
/* Don't allow names with known bad length. */
if (sfep->namelen == 0)
return __this_address;
/*
* Check that the variable-length part of the structure is
* within the data buffer. The next entry starts after the
* name component, so nextentry is an acceptable test.
*/
next_sfep = dops->sf_nextentry(sfp, sfep);
if (endp < (char *)next_sfep)
return __this_address;
/* Check that the offsets always increase. */
if (xfs_dir2_sf_get_offset(sfep) < offset)
return __this_address;
/* Check the inode number. */
ino = dops->sf_get_ino(sfp, sfep);
i8count += ino > XFS_DIR2_MAX_SHORT_INUM;
error = xfs_dir_ino_validate(mp, ino);
if (error)
return __this_address;
/* Check the file type. */
filetype = dops->sf_get_ftype(sfep);
if (filetype >= XFS_DIR3_FT_MAX)
return __this_address;
offset = xfs_dir2_sf_get_offset(sfep) +
dops->data_entsize(sfep->namelen);
sfep = next_sfep;
}
if (i8count != sfp->i8count)
return __this_address;
if ((void *)sfep != (void *)endp)
return __this_address;
/* Make sure this whole thing ought to be in local format. */
if (offset + (sfp->count + 2) * (uint)sizeof(xfs_dir2_leaf_entry_t) +
(uint)sizeof(xfs_dir2_block_tail_t) > mp->m_dir_geo->blksize)
return __this_address;
return NULL;
}
/*
* Create a new (shortform) directory.
*/
int /* error, always 0 */
xfs_dir2_sf_create(
xfs_da_args_t *args, /* operation arguments */
xfs_ino_t pino) /* parent inode number */
{
xfs_inode_t *dp; /* incore directory inode */
int i8count; /* parent inode is an 8-byte number */
xfs_dir2_sf_hdr_t *sfp; /* shortform structure */
int size; /* directory size */
trace_xfs_dir2_sf_create(args);
dp = args->dp;
ASSERT(dp != NULL);
ASSERT(dp->i_d.di_size == 0);
/*
* If it's currently a zero-length extent file,
* convert it to local format.
*/
if (dp->i_d.di_format == XFS_DINODE_FMT_EXTENTS) {
dp->i_df.if_flags &= ~XFS_IFEXTENTS; /* just in case */
dp->i_d.di_format = XFS_DINODE_FMT_LOCAL;
xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE);
dp->i_df.if_flags |= XFS_IFINLINE;
}
ASSERT(dp->i_df.if_flags & XFS_IFINLINE);
ASSERT(dp->i_df.if_bytes == 0);
i8count = pino > XFS_DIR2_MAX_SHORT_INUM;
size = xfs_dir2_sf_hdr_size(i8count);
/*
* Make a buffer for the data.
*/
xfs_idata_realloc(dp, size, XFS_DATA_FORK);
/*
* Fill in the header,
*/
sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
sfp->i8count = i8count;
/*
* Now can put in the inode number, since i8count is set.
*/
dp->d_ops->sf_put_parent_ino(sfp, pino);
sfp->count = 0;
dp->i_d.di_size = size;
xfs_dir2_sf_check(args);
xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE | XFS_ILOG_DDATA);
return 0;
}
/*
* Lookup an entry in a shortform directory.
* Returns EEXIST if found, ENOENT if not found.
*/
int /* error */
xfs_dir2_sf_lookup(
xfs_da_args_t *args) /* operation arguments */
{
xfs_inode_t *dp; /* incore directory inode */
int i; /* entry index */
int error;
xfs_dir2_sf_entry_t *sfep; /* shortform directory entry */
xfs_dir2_sf_hdr_t *sfp; /* shortform structure */
enum xfs_dacmp cmp; /* comparison result */
xfs_dir2_sf_entry_t *ci_sfep; /* case-insens. entry */
trace_xfs_dir2_sf_lookup(args);
xfs_dir2_sf_check(args);
dp = args->dp;
ASSERT(dp->i_df.if_flags & XFS_IFINLINE);
/*
* Bail out if the directory is way too short.
*/
if (dp->i_d.di_size < offsetof(xfs_dir2_sf_hdr_t, parent)) {
ASSERT(XFS_FORCED_SHUTDOWN(dp->i_mount));
return -EIO;
}
ASSERT(dp->i_df.if_bytes == dp->i_d.di_size);
ASSERT(dp->i_df.if_u1.if_data != NULL);
sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
ASSERT(dp->i_d.di_size >= xfs_dir2_sf_hdr_size(sfp->i8count));
/*
* Special case for .
*/
if (args->namelen == 1 && args->name[0] == '.') {
args->inumber = dp->i_ino;
args->cmpresult = XFS_CMP_EXACT;
args->filetype = XFS_DIR3_FT_DIR;
return -EEXIST;
}
/*
* Special case for ..
*/
if (args->namelen == 2 &&
args->name[0] == '.' && args->name[1] == '.') {
args->inumber = dp->d_ops->sf_get_parent_ino(sfp);
args->cmpresult = XFS_CMP_EXACT;
args->filetype = XFS_DIR3_FT_DIR;
return -EEXIST;
}
/*
* Loop over all the entries trying to match ours.
*/
ci_sfep = NULL;
for (i = 0, sfep = xfs_dir2_sf_firstentry(sfp); i < sfp->count;
i++, sfep = dp->d_ops->sf_nextentry(sfp, sfep)) {
/*
* Compare name and if it's an exact match, return the inode
* number. If it's the first case-insensitive match, store the
* inode number and continue looking for an exact match.
*/
cmp = dp->i_mount->m_dirnameops->compname(args, sfep->name,
sfep->namelen);
if (cmp != XFS_CMP_DIFFERENT && cmp != args->cmpresult) {
args->cmpresult = cmp;
args->inumber = dp->d_ops->sf_get_ino(sfp, sfep);
args->filetype = dp->d_ops->sf_get_ftype(sfep);
if (cmp == XFS_CMP_EXACT)
return -EEXIST;
ci_sfep = sfep;
}
}
ASSERT(args->op_flags & XFS_DA_OP_OKNOENT);
/*
* Here, we can only be doing a lookup (not a rename or replace).
* If a case-insensitive match was not found, return -ENOENT.
*/
if (!ci_sfep)
return -ENOENT;
/* otherwise process the CI match as required by the caller */
error = xfs_dir_cilookup_result(args, ci_sfep->name, ci_sfep->namelen);
return error;
}
/*
* Remove an entry from a shortform directory.
*/
int /* error */
xfs_dir2_sf_removename(
xfs_da_args_t *args)
{
int byteoff; /* offset of removed entry */
xfs_inode_t *dp; /* incore directory inode */
int entsize; /* this entry's size */
int i; /* shortform entry index */
int newsize; /* new inode size */
int oldsize; /* old inode size */
xfs_dir2_sf_entry_t *sfep; /* shortform directory entry */
xfs_dir2_sf_hdr_t *sfp; /* shortform structure */
trace_xfs_dir2_sf_removename(args);
dp = args->dp;
ASSERT(dp->i_df.if_flags & XFS_IFINLINE);
oldsize = (int)dp->i_d.di_size;
/*
* Bail out if the directory is way too short.
*/
if (oldsize < offsetof(xfs_dir2_sf_hdr_t, parent)) {
ASSERT(XFS_FORCED_SHUTDOWN(dp->i_mount));
return -EIO;
}
ASSERT(dp->i_df.if_bytes == oldsize);
ASSERT(dp->i_df.if_u1.if_data != NULL);
sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
ASSERT(oldsize >= xfs_dir2_sf_hdr_size(sfp->i8count));
/*
* Loop over the old directory entries.
* Find the one we're deleting.
*/
for (i = 0, sfep = xfs_dir2_sf_firstentry(sfp); i < sfp->count;
i++, sfep = dp->d_ops->sf_nextentry(sfp, sfep)) {
if (xfs_da_compname(args, sfep->name, sfep->namelen) ==
XFS_CMP_EXACT) {
ASSERT(dp->d_ops->sf_get_ino(sfp, sfep) ==
args->inumber);
break;
}
}
/*
* Didn't find it.
*/
if (i == sfp->count)
return -ENOENT;
/*
* Calculate sizes.
*/
byteoff = (int)((char *)sfep - (char *)sfp);
entsize = dp->d_ops->sf_entsize(sfp, args->namelen);
newsize = oldsize - entsize;
/*
* Copy the part if any after the removed entry, sliding it down.
*/
if (byteoff + entsize < oldsize)
memmove((char *)sfp + byteoff, (char *)sfp + byteoff + entsize,
oldsize - (byteoff + entsize));
/*
* Fix up the header and file size.
*/
sfp->count--;
dp->i_d.di_size = newsize;
/*
* Reallocate, making it smaller.
*/
xfs_idata_realloc(dp, newsize - oldsize, XFS_DATA_FORK);
sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
/*
* Are we changing inode number size?
*/
if (args->inumber > XFS_DIR2_MAX_SHORT_INUM) {
if (sfp->i8count == 1)
xfs_dir2_sf_toino4(args);
else
sfp->i8count--;
}
xfs_dir2_sf_check(args);
xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE | XFS_ILOG_DDATA);
return 0;
}
/*
* Replace the inode number of an entry in a shortform directory.
*/
int /* error */
xfs_dir2_sf_replace(
xfs_da_args_t *args) /* operation arguments */
{
xfs_inode_t *dp; /* incore directory inode */
int i; /* entry index */
xfs_ino_t ino=0; /* entry old inode number */
int i8elevated; /* sf_toino8 set i8count=1 */
xfs_dir2_sf_entry_t *sfep; /* shortform directory entry */
xfs_dir2_sf_hdr_t *sfp; /* shortform structure */
trace_xfs_dir2_sf_replace(args);
dp = args->dp;
ASSERT(dp->i_df.if_flags & XFS_IFINLINE);
/*
* Bail out if the shortform directory is way too small.
*/
if (dp->i_d.di_size < offsetof(xfs_dir2_sf_hdr_t, parent)) {
ASSERT(XFS_FORCED_SHUTDOWN(dp->i_mount));
return -EIO;
}
ASSERT(dp->i_df.if_bytes == dp->i_d.di_size);
ASSERT(dp->i_df.if_u1.if_data != NULL);
sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
ASSERT(dp->i_d.di_size >= xfs_dir2_sf_hdr_size(sfp->i8count));
/*
* New inode number is large, and need to convert to 8-byte inodes.
*/
if (args->inumber > XFS_DIR2_MAX_SHORT_INUM && sfp->i8count == 0) {
int error; /* error return value */
int newsize; /* new inode size */
newsize = dp->i_df.if_bytes + (sfp->count + 1) * XFS_INO64_DIFF;
/*
* Won't fit as shortform, convert to block then do replace.
*/
if (newsize > XFS_IFORK_DSIZE(dp)) {
error = xfs_dir2_sf_to_block(args);
if (error) {
return error;
}
return xfs_dir2_block_replace(args);
}
/*
* Still fits, convert to 8-byte now.
*/
xfs_dir2_sf_toino8(args);
i8elevated = 1;
sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
} else
i8elevated = 0;
ASSERT(args->namelen != 1 || args->name[0] != '.');
/*
* Replace ..'s entry.
*/
if (args->namelen == 2 &&
args->name[0] == '.' && args->name[1] == '.') {
ino = dp->d_ops->sf_get_parent_ino(sfp);
ASSERT(args->inumber != ino);
dp->d_ops->sf_put_parent_ino(sfp, args->inumber);
}
/*
* Normal entry, look for the name.
*/
else {
for (i = 0, sfep = xfs_dir2_sf_firstentry(sfp); i < sfp->count;
i++, sfep = dp->d_ops->sf_nextentry(sfp, sfep)) {
if (xfs_da_compname(args, sfep->name, sfep->namelen) ==
XFS_CMP_EXACT) {
ino = dp->d_ops->sf_get_ino(sfp, sfep);
ASSERT(args->inumber != ino);
dp->d_ops->sf_put_ino(sfp, sfep, args->inumber);
dp->d_ops->sf_put_ftype(sfep, args->filetype);
break;
}
}
/*
* Didn't find it.
*/
if (i == sfp->count) {
ASSERT(args->op_flags & XFS_DA_OP_OKNOENT);
if (i8elevated)
xfs_dir2_sf_toino4(args);
return -ENOENT;
}
}
/*
* See if the old number was large, the new number is small.
*/
if (ino > XFS_DIR2_MAX_SHORT_INUM &&
args->inumber <= XFS_DIR2_MAX_SHORT_INUM) {
/*
* And the old count was one, so need to convert to small.
*/
if (sfp->i8count == 1)
xfs_dir2_sf_toino4(args);
else
sfp->i8count--;
}
/*
* See if the old number was small, the new number is large.
*/
if (ino <= XFS_DIR2_MAX_SHORT_INUM &&
args->inumber > XFS_DIR2_MAX_SHORT_INUM) {
/*
* add to the i8count unless we just converted to 8-byte
* inodes (which does an implied i8count = 1)
*/
ASSERT(sfp->i8count != 0);
if (!i8elevated)
sfp->i8count++;
}
xfs_dir2_sf_check(args);
xfs_trans_log_inode(args->trans, dp, XFS_ILOG_DDATA);
return 0;
}
/*
* Convert from 8-byte inode numbers to 4-byte inode numbers.
* The last 8-byte inode number is gone, but the count is still 1.
*/
static void
xfs_dir2_sf_toino4(
xfs_da_args_t *args) /* operation arguments */
{
char *buf; /* old dir's buffer */
xfs_inode_t *dp; /* incore directory inode */
int i; /* entry index */
int newsize; /* new inode size */
xfs_dir2_sf_entry_t *oldsfep; /* old sf entry */
xfs_dir2_sf_hdr_t *oldsfp; /* old sf directory */
int oldsize; /* old inode size */
xfs_dir2_sf_entry_t *sfep; /* new sf entry */
xfs_dir2_sf_hdr_t *sfp; /* new sf directory */
trace_xfs_dir2_sf_toino4(args);
dp = args->dp;
/*
* Copy the old directory to the buffer.
* Then nuke it from the inode, and add the new buffer to the inode.
* Don't want xfs_idata_realloc copying the data here.
*/
oldsize = dp->i_df.if_bytes;
buf = kmem_alloc(oldsize, KM_SLEEP);
oldsfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
ASSERT(oldsfp->i8count == 1);
memcpy(buf, oldsfp, oldsize);
/*
* Compute the new inode size.
*/
newsize = oldsize - (oldsfp->count + 1) * XFS_INO64_DIFF;
xfs_idata_realloc(dp, -oldsize, XFS_DATA_FORK);
xfs_idata_realloc(dp, newsize, XFS_DATA_FORK);
/*
* Reset our pointers, the data has moved.
*/
oldsfp = (xfs_dir2_sf_hdr_t *)buf;
sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
/*
* Fill in the new header.
*/
sfp->count = oldsfp->count;
sfp->i8count = 0;
dp->d_ops->sf_put_parent_ino(sfp, dp->d_ops->sf_get_parent_ino(oldsfp));
/*
* Copy the entries field by field.
*/
for (i = 0, sfep = xfs_dir2_sf_firstentry(sfp),
oldsfep = xfs_dir2_sf_firstentry(oldsfp);
i < sfp->count;
i++, sfep = dp->d_ops->sf_nextentry(sfp, sfep),
oldsfep = dp->d_ops->sf_nextentry(oldsfp, oldsfep)) {
sfep->namelen = oldsfep->namelen;
memcpy(sfep->offset, oldsfep->offset, sizeof(sfep->offset));
memcpy(sfep->name, oldsfep->name, sfep->namelen);
dp->d_ops->sf_put_ino(sfp, sfep,
dp->d_ops->sf_get_ino(oldsfp, oldsfep));
dp->d_ops->sf_put_ftype(sfep, dp->d_ops->sf_get_ftype(oldsfep));
}
/*
* Clean up the inode.
*/
kmem_free(buf);
dp->i_d.di_size = newsize;
xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE | XFS_ILOG_DDATA);
}
/*
* Convert existing entries from 4-byte inode numbers to 8-byte inode numbers.
* The new entry w/ an 8-byte inode number is not there yet; we leave with
* i8count set to 1, but no corresponding 8-byte entry.
*/
static void
xfs_dir2_sf_toino8(
xfs_da_args_t *args) /* operation arguments */
{
char *buf; /* old dir's buffer */
xfs_inode_t *dp; /* incore directory inode */
int i; /* entry index */
int newsize; /* new inode size */
xfs_dir2_sf_entry_t *oldsfep; /* old sf entry */
xfs_dir2_sf_hdr_t *oldsfp; /* old sf directory */
int oldsize; /* old inode size */
xfs_dir2_sf_entry_t *sfep; /* new sf entry */
xfs_dir2_sf_hdr_t *sfp; /* new sf directory */
trace_xfs_dir2_sf_toino8(args);
dp = args->dp;
/*
* Copy the old directory to the buffer.
* Then nuke it from the inode, and add the new buffer to the inode.
* Don't want xfs_idata_realloc copying the data here.
*/
oldsize = dp->i_df.if_bytes;
buf = kmem_alloc(oldsize, KM_SLEEP);
oldsfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
ASSERT(oldsfp->i8count == 0);
memcpy(buf, oldsfp, oldsize);
/*
* Compute the new inode size (nb: entry count + 1 for parent)
*/
newsize = oldsize + (oldsfp->count + 1) * XFS_INO64_DIFF;
xfs_idata_realloc(dp, -oldsize, XFS_DATA_FORK);
xfs_idata_realloc(dp, newsize, XFS_DATA_FORK);
/*
* Reset our pointers, the data has moved.
*/
oldsfp = (xfs_dir2_sf_hdr_t *)buf;
sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data;
/*
* Fill in the new header.
*/
sfp->count = oldsfp->count;
sfp->i8count = 1;
dp->d_ops->sf_put_parent_ino(sfp, dp->d_ops->sf_get_parent_ino(oldsfp));
/*
* Copy the entries field by field.
*/
for (i = 0, sfep = xfs_dir2_sf_firstentry(sfp),
oldsfep = xfs_dir2_sf_firstentry(oldsfp);
i < sfp->count;
i++, sfep = dp->d_ops->sf_nextentry(sfp, sfep),
oldsfep = dp->d_ops->sf_nextentry(oldsfp, oldsfep)) {
sfep->namelen = oldsfep->namelen;
memcpy(sfep->offset, oldsfep->offset, sizeof(sfep->offset));
memcpy(sfep->name, oldsfep->name, sfep->namelen);
dp->d_ops->sf_put_ino(sfp, sfep,
dp->d_ops->sf_get_ino(oldsfp, oldsfep));
dp->d_ops->sf_put_ftype(sfep, dp->d_ops->sf_get_ftype(oldsfep));
}
/*
* Clean up the inode.
*/
kmem_free(buf);
dp->i_d.di_size = newsize;
xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE | XFS_ILOG_DDATA);
}