// 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_shared.h"
#include "xfs_format.h"
#include "xfs_log_format.h"
#include "xfs_trans_resv.h"
#include "xfs_mount.h"
#include "xfs_inode.h"
#include "xfs_trans.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);
int
xfs_dir2_sf_entsize(
struct xfs_mount *mp,
struct xfs_dir2_sf_hdr *hdr,
int len)
{
int count = len;
count += sizeof(struct xfs_dir2_sf_entry); /* namelen + offset */
count += hdr->i8count ? XFS_INO64_SIZE : XFS_INO32_SIZE; /* ino # */
if (xfs_has_ftype(mp))
count += sizeof(uint8_t);
return count;
}
struct xfs_dir2_sf_entry *
xfs_dir2_sf_nextentry(
struct xfs_mount *mp,
struct xfs_dir2_sf_hdr *hdr,
struct xfs_dir2_sf_entry *sfep)
{
return (void *)sfep + xfs_dir2_sf_entsize(mp, hdr, sfep->namelen);
}
/*
* In short-form directory entries the inode numbers are stored at variable
* offset behind the entry name. If the entry stores a filetype value, then it
* sits between the name and the inode number. The actual inode numbers can
* come in two formats as well, either 4 bytes or 8 bytes wide.
*/
xfs_ino_t
xfs_dir2_sf_get_ino(
struct xfs_mount *mp,
struct xfs_dir2_sf_hdr *hdr,
struct xfs_dir2_sf_entry *sfep)
{
uint8_t *from = sfep->name + sfep->namelen;
if (xfs_has_ftype(mp))
from++;
if (!hdr->i8count)
return get_unaligned_be32(from);
return get_unaligned_be64(from) & XFS_MAXINUMBER;
}
void
xfs_dir2_sf_put_ino(
struct xfs_mount *mp,
struct xfs_dir2_sf_hdr *hdr,
struct xfs_dir2_sf_entry *sfep,
xfs_ino_t ino)
{
uint8_t *to = sfep->name + sfep->namelen;
ASSERT(ino <= XFS_MAXINUMBER);
if (xfs_has_ftype(mp))
to++;
if (hdr->i8count)
put_unaligned_be64(ino, to);
else
put_unaligned_be32(ino, to);
}
xfs_ino_t
xfs_dir2_sf_get_parent_ino(
struct xfs_dir2_sf_hdr *hdr)
{
if (!hdr->i8count)
return get_unaligned_be32(hdr->parent);
return get_unaligned_be64(hdr->parent) & XFS_MAXINUMBER;
}
void
xfs_dir2_sf_put_parent_ino(
struct xfs_dir2_sf_hdr *hdr,
xfs_ino_t ino)
{
ASSERT(ino <= XFS_MAXINUMBER);
if (hdr->i8count)
put_unaligned_be64(ino, hdr->parent);
else
put_unaligned_be32(ino, hdr->parent);
}
/*
* The file type field is stored at the end of the name for filetype enabled
* shortform directories, or not at all otherwise.
*/
uint8_t
xfs_dir2_sf_get_ftype(
struct xfs_mount *mp,
struct xfs_dir2_sf_entry *sfep)
{
if (xfs_has_ftype(mp)) {
uint8_t ftype = sfep->name[sfep->namelen];
if (ftype < XFS_DIR3_FT_MAX)
return ftype;
}
return XFS_DIR3_FT_UNKNOWN;
}
void
xfs_dir2_sf_put_ftype(
struct xfs_mount *mp,
struct xfs_dir2_sf_entry *sfep,
uint8_t ftype)
{
ASSERT(ftype < XFS_DIR3_FT_MAX);
if (xfs_has_ftype(mp))
sfep->name[sfep->namelen] = ftype;
}
/*
* 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_has_ftype(mp) ? 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_inode_data_fork_size(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_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(
struct xfs_da_args *args, /* operation arguments */
struct xfs_buf *bp,
int size, /* shortform directory size */
struct xfs_dir2_sf_hdr *sfhp) /* shortform directory hdr */
{
struct xfs_inode *dp = args->dp;
struct xfs_mount *mp = dp->i_mount;
int error; /* error return value */
int logflags; /* inode logging flags */
struct xfs_dir2_sf_entry *sfep; /* shortform entry */
struct xfs_dir2_sf_hdr *sfp; /* shortform directory header */
unsigned int offset = args->geo->data_entry_offset;
unsigned int end;
trace_xfs_dir2_block_to_sf(args);
/*
* 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.
*/
sfp = kmalloc(mp->m_sb.sb_inodesize, GFP_KERNEL | __GFP_NOFAIL);
memcpy(sfp, sfhp, xfs_dir2_sf_hdr_size(sfhp->i8count));
/*
* Loop over the active and unused entries. Stop when we reach the
* leaf/tail portion of the block.
*/
end = xfs_dir3_data_end_offset(args->geo, bp->b_addr);
sfep = xfs_dir2_sf_firstentry(sfp);
while (offset < end) {
struct xfs_dir2_data_unused *dup = bp->b_addr + offset;
struct xfs_dir2_data_entry *dep = bp->b_addr + offset;
/*
* If it's unused, just skip over it.
*/
if (be16_to_cpu(dup->freetag) == XFS_DIR2_DATA_FREE_TAG) {
offset += be16_to_cpu(dup->length);
continue;
}
/*
* 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) ==
xfs_dir2_sf_get_parent_ino(sfp));
/*
* Normal entry, copy it into shortform.
*/
else {
sfep->namelen = dep->namelen;
xfs_dir2_sf_put_offset(sfep, offset);
memcpy(sfep->name, dep->name, dep->namelen);
xfs_dir2_sf_put_ino(mp, sfp, sfep,
be64_to_cpu(dep->inumber));
xfs_dir2_sf_put_ftype(mp, sfep,
xfs_dir2_data_get_ftype(mp, dep));
sfep = xfs_dir2_sf_nextentry(mp, sfp, sfep);
}
offset += xfs_dir2_data_entsize(mp, 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, sfp, size);
dp->i_df.if_format = XFS_DINODE_FMT_LOCAL;
dp->i_disk_size = size;
logflags |= XFS_ILOG_DDATA;
xfs_dir2_sf_check(args);
out:
xfs_trans_log_inode(args->trans, dp, logflags);
kfree(sfp);
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 */
{
struct xfs_inode *dp = args->dp;
struct xfs_dir2_sf_hdr *sfp = dp->i_df.if_data;
int error; /* error return value */
int incr_isize; /* total change in size */
int new_isize; /* 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_entry_t *sfep = NULL; /* shortform entry */
trace_xfs_dir2_sf_addname(args);
ASSERT(xfs_dir2_sf_lookup(args) == -ENOENT);
ASSERT(dp->i_df.if_format == XFS_DINODE_FMT_LOCAL);
ASSERT(dp->i_disk_size >= offsetof(struct xfs_dir2_sf_hdr, parent));
ASSERT(dp->i_df.if_bytes == dp->i_disk_size);
ASSERT(sfp != NULL);
ASSERT(dp->i_disk_size >= xfs_dir2_sf_hdr_size(sfp->i8count));
/*
* Compute entry (and change in) size.
*/
incr_isize = xfs_dir2_sf_entsize(dp->i_mount, 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_disk_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_inode_data_fork_size(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 */
{
struct xfs_inode *dp = args->dp;
struct xfs_mount *mp = dp->i_mount;
struct xfs_dir2_sf_hdr *sfp = dp->i_df.if_data;
int byteoff = (int)((char *)sfep - (char *)sfp);
/*
* Grow the in-inode space.
*/
sfp = xfs_idata_realloc(dp, xfs_dir2_sf_entsize(mp, sfp, args->namelen),
XFS_DATA_FORK);
/*
* Need to set up again due to realloc of the inode 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);
xfs_dir2_sf_put_ino(mp, sfp, sfep, args->inumber);
xfs_dir2_sf_put_ftype(mp, sfep, args->filetype);
/*
* Update the header and inode.
*/
sfp->count++;
if (args->inumber > XFS_DIR2_MAX_SHORT_INUM)
sfp->i8count++;
dp->i_disk_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 */
{
struct xfs_inode *dp = args->dp;
struct xfs_mount *mp = dp->i_mount;
int add_datasize; /* data size need for new ent */
char *buf; /* buffer for old */
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 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.
*/
old_isize = (int)dp->i_disk_size;
buf = kmalloc(old_isize, GFP_KERNEL | __GFP_NOFAIL);
oldsfp = (xfs_dir2_sf_hdr_t *)buf;
memcpy(oldsfp, dp->i_df.if_data, 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 = args->geo->data_first_offset,
oldsfep = xfs_dir2_sf_firstentry(oldsfp),
add_datasize = xfs_dir2_data_entsize(mp, args->namelen),
eof = (char *)oldsfep == &buf[old_isize];
!eof;
offset = new_offset + xfs_dir2_data_entsize(mp, oldsfep->namelen),
oldsfep = xfs_dir2_sf_nextentry(mp, 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);
sfp = xfs_idata_realloc(dp, new_isize, XFS_DATA_FORK);
/*
* 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);
xfs_dir2_sf_put_ino(mp, sfp, sfep, args->inumber);
xfs_dir2_sf_put_ftype(mp, 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 = xfs_dir2_sf_nextentry(mp, sfp, sfep);
memcpy(sfep, oldsfep, old_isize - nbytes);
}
kfree(buf);
dp->i_disk_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 */
{
struct xfs_inode *dp = args->dp;
struct xfs_mount *mp = dp->i_mount;
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 */
struct xfs_dir2_sf_hdr *sfp = dp->i_df.if_data;
int size; /* entry's data size */
int used; /* data bytes used */
size = xfs_dir2_data_entsize(mp, args->namelen);
offset = args->geo->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) +
xfs_dir2_data_entsize(mp, sfep->namelen);
sfep = xfs_dir2_sf_nextentry(mp, 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 */
{
struct xfs_inode *dp = args->dp;
struct xfs_mount *mp = dp->i_mount;
struct xfs_dir2_sf_hdr *sfp = dp->i_df.if_data;
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 */
offset = args->geo->data_first_offset;
ino = xfs_dir2_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 = xfs_dir2_sf_nextentry(mp, sfp, sfep)) {
ASSERT(xfs_dir2_sf_get_offset(sfep) >= offset);
ino = xfs_dir2_sf_get_ino(mp, sfp, sfep);
i8count += ino > XFS_DIR2_MAX_SHORT_INUM;
offset =
xfs_dir2_sf_get_offset(sfep) +
xfs_dir2_data_entsize(mp, sfep->namelen);
ASSERT(xfs_dir2_sf_get_ftype(mp, sfep) < XFS_DIR3_FT_MAX);
}
ASSERT(i8count == sfp->i8count);
ASSERT((char *)sfep - (char *)sfp == dp->i_disk_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_mount *mp,
struct xfs_dir2_sf_hdr *sfp,
int64_t size)
{
struct xfs_dir2_sf_entry *sfep;
struct xfs_dir2_sf_entry *next_sfep;
char *endp;
xfs_ino_t ino;
int i;
int i8count;
int offset;
int error;
uint8_t filetype;
/*
* 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 = xfs_dir2_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 = mp->m_dir_geo->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 = xfs_dir2_sf_nextentry(mp, 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 = xfs_dir2_sf_get_ino(mp, 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 = xfs_dir2_sf_get_ftype(mp, sfep);
if (filetype >= XFS_DIR3_FT_MAX)
return __this_address;
offset = xfs_dir2_sf_get_offset(sfep) +
xfs_dir2_data_entsize(mp, 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_disk_size == 0);
/*
* If it's currently a zero-length extent file,
* convert it to local format.
*/
if (dp->i_df.if_format == XFS_DINODE_FMT_EXTENTS) {
dp->i_df.if_format = XFS_DINODE_FMT_LOCAL;
xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE);
}
ASSERT(dp->i_df.if_format == XFS_DINODE_FMT_LOCAL);
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 and fill in the header.
*/
sfp = xfs_idata_realloc(dp, size, XFS_DATA_FORK);
sfp->i8count = i8count;
/*
* Now can put in the inode number, since i8count is set.
*/
xfs_dir2_sf_put_parent_ino(sfp, pino);
sfp->count = 0;
dp->i_disk_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 */
{
struct xfs_inode *dp = args->dp;
struct xfs_mount *mp = dp->i_mount;
struct xfs_dir2_sf_hdr *sfp = dp->i_df.if_data;
int i; /* entry index */
xfs_dir2_sf_entry_t *sfep; /* shortform directory entry */
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);
ASSERT(dp->i_df.if_format == XFS_DINODE_FMT_LOCAL);
ASSERT(dp->i_disk_size >= offsetof(struct xfs_dir2_sf_hdr, parent));
ASSERT(dp->i_df.if_bytes == dp->i_disk_size);
ASSERT(sfp != NULL);
ASSERT(dp->i_disk_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 = xfs_dir2_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 = xfs_dir2_sf_nextentry(mp, 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 = xfs_dir2_compname(args, sfep->name, sfep->namelen);
if (cmp != XFS_CMP_DIFFERENT && cmp != args->cmpresult) {
args->cmpresult = cmp;
args->inumber = xfs_dir2_sf_get_ino(mp, sfp, sfep);
args->filetype = xfs_dir2_sf_get_ftype(mp, 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 */
return xfs_dir_cilookup_result(args, ci_sfep->name, ci_sfep->namelen);
}
/*
* Remove an entry from a shortform directory.
*/
int /* error */
xfs_dir2_sf_removename(
xfs_da_args_t *args)
{
struct xfs_inode *dp = args->dp;
struct xfs_mount *mp = dp->i_mount;
struct xfs_dir2_sf_hdr *sfp = dp->i_df.if_data;
int byteoff; /* offset of removed entry */
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 */
trace_xfs_dir2_sf_removename(args);
ASSERT(dp->i_df.if_format == XFS_DINODE_FMT_LOCAL);
oldsize = (int)dp->i_disk_size;
ASSERT(oldsize >= offsetof(struct xfs_dir2_sf_hdr, parent));
ASSERT(dp->i_df.if_bytes == oldsize);
ASSERT(sfp != NULL);
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 = xfs_dir2_sf_nextentry(mp, sfp, sfep)) {
if (xfs_da_compname(args, sfep->name, sfep->namelen) ==
XFS_CMP_EXACT) {
ASSERT(xfs_dir2_sf_get_ino(mp, sfp, sfep) ==
args->inumber);
break;
}
}
/*
* Didn't find it.
*/
if (i == sfp->count)
return -ENOENT;
/*
* Calculate sizes.
*/
byteoff = (int)((char *)sfep - (char *)sfp);
entsize = xfs_dir2_sf_entsize(mp, 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_disk_size = newsize;
/*
* Reallocate, making it smaller.
*/
sfp = xfs_idata_realloc(dp, newsize - oldsize, XFS_DATA_FORK);
/*
* 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;
}
/*
* Check whether the sf dir replace operation need more blocks.
*/
static bool
xfs_dir2_sf_replace_needblock(
struct xfs_inode *dp,
xfs_ino_t inum)
{
struct xfs_dir2_sf_hdr *sfp = dp->i_df.if_data;
int newsize;
if (dp->i_df.if_format != XFS_DINODE_FMT_LOCAL)
return false;
newsize = dp->i_df.if_bytes + (sfp->count + 1) * XFS_INO64_DIFF;
return inum > XFS_DIR2_MAX_SHORT_INUM &&
sfp->i8count == 0 && newsize > xfs_inode_data_fork_size(dp);
}
/*
* Replace the inode number of an entry in a shortform directory.
*/
int /* error */
xfs_dir2_sf_replace(
xfs_da_args_t *args) /* operation arguments */
{
struct xfs_inode *dp = args->dp;
struct xfs_mount *mp = dp->i_mount;
struct xfs_dir2_sf_hdr *sfp = dp->i_df.if_data;
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 */
trace_xfs_dir2_sf_replace(args);
ASSERT(dp->i_df.if_format == XFS_DINODE_FMT_LOCAL);
ASSERT(dp->i_disk_size >= offsetof(struct xfs_dir2_sf_hdr, parent));
ASSERT(dp->i_df.if_bytes == dp->i_disk_size);
ASSERT(sfp != NULL);
ASSERT(dp->i_disk_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 */
/*
* Won't fit as shortform, convert to block then do replace.
*/
if (xfs_dir2_sf_replace_needblock(dp, args->inumber)) {
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 = dp->i_df.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 = xfs_dir2_sf_get_parent_ino(sfp);
ASSERT(args->inumber != ino);
xfs_dir2_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 = xfs_dir2_sf_nextentry(mp, sfp, sfep)) {
if (xfs_da_compname(args, sfep->name, sfep->namelen) ==
XFS_CMP_EXACT) {
ino = xfs_dir2_sf_get_ino(mp, sfp, sfep);
ASSERT(args->inumber != ino);
xfs_dir2_sf_put_ino(mp, sfp, sfep,
args->inumber);
xfs_dir2_sf_put_ftype(mp, 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 */
{
struct xfs_inode *dp = args->dp;
struct xfs_mount *mp = dp->i_mount;
struct xfs_dir2_sf_hdr *oldsfp = dp->i_df.if_data;
char *buf; /* old dir's buffer */
int i; /* entry index */
int newsize; /* new inode size */
xfs_dir2_sf_entry_t *oldsfep; /* old sf entry */
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);
/*
* 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 = kmalloc(oldsize, GFP_KERNEL | __GFP_NOFAIL);
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 = dp->i_df.if_data;
/*
* Fill in the new header.
*/
sfp->count = oldsfp->count;
sfp->i8count = 0;
xfs_dir2_sf_put_parent_ino(sfp, xfs_dir2_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 = xfs_dir2_sf_nextentry(mp, sfp, sfep),
oldsfep = xfs_dir2_sf_nextentry(mp, oldsfp, oldsfep)) {
sfep->namelen = oldsfep->namelen;
memcpy(sfep->offset, oldsfep->offset, sizeof(sfep->offset));
memcpy(sfep->name, oldsfep->name, sfep->namelen);
xfs_dir2_sf_put_ino(mp, sfp, sfep,
xfs_dir2_sf_get_ino(mp, oldsfp, oldsfep));
xfs_dir2_sf_put_ftype(mp, sfep,
xfs_dir2_sf_get_ftype(mp, oldsfep));
}
/*
* Clean up the inode.
*/
kfree(buf);
dp->i_disk_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 */
{
struct xfs_inode *dp = args->dp;
struct xfs_mount *mp = dp->i_mount;
struct xfs_dir2_sf_hdr *oldsfp = dp->i_df.if_data;
char *buf; /* old dir's buffer */
int i; /* entry index */
int newsize; /* new inode size */
xfs_dir2_sf_entry_t *oldsfep; /* old sf entry */
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);
/*
* 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 = kmalloc(oldsize, GFP_KERNEL | __GFP_NOFAIL);
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 = dp->i_df.if_data;
/*
* Fill in the new header.
*/
sfp->count = oldsfp->count;
sfp->i8count = 1;
xfs_dir2_sf_put_parent_ino(sfp, xfs_dir2_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 = xfs_dir2_sf_nextentry(mp, sfp, sfep),
oldsfep = xfs_dir2_sf_nextentry(mp, oldsfp, oldsfep)) {
sfep->namelen = oldsfep->namelen;
memcpy(sfep->offset, oldsfep->offset, sizeof(sfep->offset));
memcpy(sfep->name, oldsfep->name, sfep->namelen);
xfs_dir2_sf_put_ino(mp, sfp, sfep,
xfs_dir2_sf_get_ino(mp, oldsfp, oldsfep));
xfs_dir2_sf_put_ftype(mp, sfep,
xfs_dir2_sf_get_ftype(mp, oldsfep));
}
/*
* Clean up the inode.
*/
kfree(buf);
dp->i_disk_size = newsize;
xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE | XFS_ILOG_DDATA);
}
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