mirror of
https://github.com/torvalds/linux.git
synced 2024-12-05 10:32:35 +00:00
75c8c50fa1
Remove the shouty macro and instead use the inline function that matches other state/feature check wrapper naming. This conversion was done with sed. Signed-off-by: Dave Chinner <dchinner@redhat.com> Reviewed-by: Darrick J. Wong <djwong@kernel.org> Signed-off-by: Darrick J. Wong <djwong@kernel.org>
509 lines
12 KiB
C
509 lines
12 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* Copyright (c) 2000-2006 Silicon Graphics, Inc.
|
|
* Copyright (c) 2012-2013 Red Hat, Inc.
|
|
* All rights reserved.
|
|
*/
|
|
#include "xfs.h"
|
|
#include "xfs_shared.h"
|
|
#include "xfs_fs.h"
|
|
#include "xfs_format.h"
|
|
#include "xfs_log_format.h"
|
|
#include "xfs_trans_resv.h"
|
|
#include "xfs_bit.h"
|
|
#include "xfs_mount.h"
|
|
#include "xfs_dir2.h"
|
|
#include "xfs_inode.h"
|
|
#include "xfs_bmap.h"
|
|
#include "xfs_bmap_btree.h"
|
|
#include "xfs_quota.h"
|
|
#include "xfs_symlink.h"
|
|
#include "xfs_trans_space.h"
|
|
#include "xfs_trace.h"
|
|
#include "xfs_trans.h"
|
|
#include "xfs_ialloc.h"
|
|
|
|
/* ----- Kernel only functions below ----- */
|
|
int
|
|
xfs_readlink_bmap_ilocked(
|
|
struct xfs_inode *ip,
|
|
char *link)
|
|
{
|
|
struct xfs_mount *mp = ip->i_mount;
|
|
struct xfs_bmbt_irec mval[XFS_SYMLINK_MAPS];
|
|
struct xfs_buf *bp;
|
|
xfs_daddr_t d;
|
|
char *cur_chunk;
|
|
int pathlen = ip->i_disk_size;
|
|
int nmaps = XFS_SYMLINK_MAPS;
|
|
int byte_cnt;
|
|
int n;
|
|
int error = 0;
|
|
int fsblocks = 0;
|
|
int offset;
|
|
|
|
ASSERT(xfs_isilocked(ip, XFS_ILOCK_SHARED | XFS_ILOCK_EXCL));
|
|
|
|
fsblocks = xfs_symlink_blocks(mp, pathlen);
|
|
error = xfs_bmapi_read(ip, 0, fsblocks, mval, &nmaps, 0);
|
|
if (error)
|
|
goto out;
|
|
|
|
offset = 0;
|
|
for (n = 0; n < nmaps; n++) {
|
|
d = XFS_FSB_TO_DADDR(mp, mval[n].br_startblock);
|
|
byte_cnt = XFS_FSB_TO_B(mp, mval[n].br_blockcount);
|
|
|
|
error = xfs_buf_read(mp->m_ddev_targp, d, BTOBB(byte_cnt), 0,
|
|
&bp, &xfs_symlink_buf_ops);
|
|
if (error)
|
|
return error;
|
|
byte_cnt = XFS_SYMLINK_BUF_SPACE(mp, byte_cnt);
|
|
if (pathlen < byte_cnt)
|
|
byte_cnt = pathlen;
|
|
|
|
cur_chunk = bp->b_addr;
|
|
if (xfs_has_crc(mp)) {
|
|
if (!xfs_symlink_hdr_ok(ip->i_ino, offset,
|
|
byte_cnt, bp)) {
|
|
error = -EFSCORRUPTED;
|
|
xfs_alert(mp,
|
|
"symlink header does not match required off/len/owner (0x%x/Ox%x,0x%llx)",
|
|
offset, byte_cnt, ip->i_ino);
|
|
xfs_buf_relse(bp);
|
|
goto out;
|
|
|
|
}
|
|
|
|
cur_chunk += sizeof(struct xfs_dsymlink_hdr);
|
|
}
|
|
|
|
memcpy(link + offset, cur_chunk, byte_cnt);
|
|
|
|
pathlen -= byte_cnt;
|
|
offset += byte_cnt;
|
|
|
|
xfs_buf_relse(bp);
|
|
}
|
|
ASSERT(pathlen == 0);
|
|
|
|
link[ip->i_disk_size] = '\0';
|
|
error = 0;
|
|
|
|
out:
|
|
return error;
|
|
}
|
|
|
|
int
|
|
xfs_readlink(
|
|
struct xfs_inode *ip,
|
|
char *link)
|
|
{
|
|
struct xfs_mount *mp = ip->i_mount;
|
|
xfs_fsize_t pathlen;
|
|
int error = 0;
|
|
|
|
trace_xfs_readlink(ip);
|
|
|
|
ASSERT(ip->i_df.if_format != XFS_DINODE_FMT_LOCAL);
|
|
|
|
if (xfs_is_shutdown(mp))
|
|
return -EIO;
|
|
|
|
xfs_ilock(ip, XFS_ILOCK_SHARED);
|
|
|
|
pathlen = ip->i_disk_size;
|
|
if (!pathlen)
|
|
goto out;
|
|
|
|
if (pathlen < 0 || pathlen > XFS_SYMLINK_MAXLEN) {
|
|
xfs_alert(mp, "%s: inode (%llu) bad symlink length (%lld)",
|
|
__func__, (unsigned long long) ip->i_ino,
|
|
(long long) pathlen);
|
|
ASSERT(0);
|
|
error = -EFSCORRUPTED;
|
|
goto out;
|
|
}
|
|
|
|
|
|
error = xfs_readlink_bmap_ilocked(ip, link);
|
|
|
|
out:
|
|
xfs_iunlock(ip, XFS_ILOCK_SHARED);
|
|
return error;
|
|
}
|
|
|
|
int
|
|
xfs_symlink(
|
|
struct user_namespace *mnt_userns,
|
|
struct xfs_inode *dp,
|
|
struct xfs_name *link_name,
|
|
const char *target_path,
|
|
umode_t mode,
|
|
struct xfs_inode **ipp)
|
|
{
|
|
struct xfs_mount *mp = dp->i_mount;
|
|
struct xfs_trans *tp = NULL;
|
|
struct xfs_inode *ip = NULL;
|
|
int error = 0;
|
|
int pathlen;
|
|
bool unlock_dp_on_error = false;
|
|
xfs_fileoff_t first_fsb;
|
|
xfs_filblks_t fs_blocks;
|
|
int nmaps;
|
|
struct xfs_bmbt_irec mval[XFS_SYMLINK_MAPS];
|
|
xfs_daddr_t d;
|
|
const char *cur_chunk;
|
|
int byte_cnt;
|
|
int n;
|
|
struct xfs_buf *bp;
|
|
prid_t prid;
|
|
struct xfs_dquot *udqp = NULL;
|
|
struct xfs_dquot *gdqp = NULL;
|
|
struct xfs_dquot *pdqp = NULL;
|
|
uint resblks;
|
|
xfs_ino_t ino;
|
|
|
|
*ipp = NULL;
|
|
|
|
trace_xfs_symlink(dp, link_name);
|
|
|
|
if (xfs_is_shutdown(mp))
|
|
return -EIO;
|
|
|
|
/*
|
|
* Check component lengths of the target path name.
|
|
*/
|
|
pathlen = strlen(target_path);
|
|
if (pathlen >= XFS_SYMLINK_MAXLEN) /* total string too long */
|
|
return -ENAMETOOLONG;
|
|
ASSERT(pathlen > 0);
|
|
|
|
prid = xfs_get_initial_prid(dp);
|
|
|
|
/*
|
|
* Make sure that we have allocated dquot(s) on disk.
|
|
*/
|
|
error = xfs_qm_vop_dqalloc(dp, mapped_fsuid(mnt_userns),
|
|
mapped_fsgid(mnt_userns), prid,
|
|
XFS_QMOPT_QUOTALL | XFS_QMOPT_INHERIT,
|
|
&udqp, &gdqp, &pdqp);
|
|
if (error)
|
|
return error;
|
|
|
|
/*
|
|
* The symlink will fit into the inode data fork?
|
|
* There can't be any attributes so we get the whole variable part.
|
|
*/
|
|
if (pathlen <= XFS_LITINO(mp))
|
|
fs_blocks = 0;
|
|
else
|
|
fs_blocks = xfs_symlink_blocks(mp, pathlen);
|
|
resblks = XFS_SYMLINK_SPACE_RES(mp, link_name->len, fs_blocks);
|
|
|
|
error = xfs_trans_alloc_icreate(mp, &M_RES(mp)->tr_symlink, udqp, gdqp,
|
|
pdqp, resblks, &tp);
|
|
if (error)
|
|
goto out_release_dquots;
|
|
|
|
xfs_ilock(dp, XFS_ILOCK_EXCL | XFS_ILOCK_PARENT);
|
|
unlock_dp_on_error = true;
|
|
|
|
/*
|
|
* Check whether the directory allows new symlinks or not.
|
|
*/
|
|
if (dp->i_diflags & XFS_DIFLAG_NOSYMLINKS) {
|
|
error = -EPERM;
|
|
goto out_trans_cancel;
|
|
}
|
|
|
|
error = xfs_iext_count_may_overflow(dp, XFS_DATA_FORK,
|
|
XFS_IEXT_DIR_MANIP_CNT(mp));
|
|
if (error)
|
|
goto out_trans_cancel;
|
|
|
|
/*
|
|
* Allocate an inode for the symlink.
|
|
*/
|
|
error = xfs_dialloc(&tp, dp->i_ino, S_IFLNK, &ino);
|
|
if (!error)
|
|
error = xfs_init_new_inode(mnt_userns, tp, dp, ino,
|
|
S_IFLNK | (mode & ~S_IFMT), 1, 0, prid,
|
|
false, &ip);
|
|
if (error)
|
|
goto out_trans_cancel;
|
|
|
|
/*
|
|
* Now we join the directory inode to the transaction. We do not do it
|
|
* earlier because xfs_dir_ialloc might commit the previous transaction
|
|
* (and release all the locks). An error from here on will result in
|
|
* the transaction cancel unlocking dp so don't do it explicitly in the
|
|
* error path.
|
|
*/
|
|
xfs_trans_ijoin(tp, dp, XFS_ILOCK_EXCL);
|
|
unlock_dp_on_error = false;
|
|
|
|
/*
|
|
* Also attach the dquot(s) to it, if applicable.
|
|
*/
|
|
xfs_qm_vop_create_dqattach(tp, ip, udqp, gdqp, pdqp);
|
|
|
|
resblks -= XFS_IALLOC_SPACE_RES(mp);
|
|
/*
|
|
* If the symlink will fit into the inode, write it inline.
|
|
*/
|
|
if (pathlen <= XFS_IFORK_DSIZE(ip)) {
|
|
xfs_init_local_fork(ip, XFS_DATA_FORK, target_path, pathlen);
|
|
|
|
ip->i_disk_size = pathlen;
|
|
ip->i_df.if_format = XFS_DINODE_FMT_LOCAL;
|
|
xfs_trans_log_inode(tp, ip, XFS_ILOG_DDATA | XFS_ILOG_CORE);
|
|
} else {
|
|
int offset;
|
|
|
|
first_fsb = 0;
|
|
nmaps = XFS_SYMLINK_MAPS;
|
|
|
|
error = xfs_bmapi_write(tp, ip, first_fsb, fs_blocks,
|
|
XFS_BMAPI_METADATA, resblks, mval, &nmaps);
|
|
if (error)
|
|
goto out_trans_cancel;
|
|
|
|
resblks -= fs_blocks;
|
|
ip->i_disk_size = pathlen;
|
|
xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
|
|
|
|
cur_chunk = target_path;
|
|
offset = 0;
|
|
for (n = 0; n < nmaps; n++) {
|
|
char *buf;
|
|
|
|
d = XFS_FSB_TO_DADDR(mp, mval[n].br_startblock);
|
|
byte_cnt = XFS_FSB_TO_B(mp, mval[n].br_blockcount);
|
|
error = xfs_trans_get_buf(tp, mp->m_ddev_targp, d,
|
|
BTOBB(byte_cnt), 0, &bp);
|
|
if (error)
|
|
goto out_trans_cancel;
|
|
bp->b_ops = &xfs_symlink_buf_ops;
|
|
|
|
byte_cnt = XFS_SYMLINK_BUF_SPACE(mp, byte_cnt);
|
|
byte_cnt = min(byte_cnt, pathlen);
|
|
|
|
buf = bp->b_addr;
|
|
buf += xfs_symlink_hdr_set(mp, ip->i_ino, offset,
|
|
byte_cnt, bp);
|
|
|
|
memcpy(buf, cur_chunk, byte_cnt);
|
|
|
|
cur_chunk += byte_cnt;
|
|
pathlen -= byte_cnt;
|
|
offset += byte_cnt;
|
|
|
|
xfs_trans_buf_set_type(tp, bp, XFS_BLFT_SYMLINK_BUF);
|
|
xfs_trans_log_buf(tp, bp, 0, (buf + byte_cnt - 1) -
|
|
(char *)bp->b_addr);
|
|
}
|
|
ASSERT(pathlen == 0);
|
|
}
|
|
i_size_write(VFS_I(ip), ip->i_disk_size);
|
|
|
|
/*
|
|
* Create the directory entry for the symlink.
|
|
*/
|
|
error = xfs_dir_createname(tp, dp, link_name, ip->i_ino, resblks);
|
|
if (error)
|
|
goto out_trans_cancel;
|
|
xfs_trans_ichgtime(tp, dp, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
|
|
xfs_trans_log_inode(tp, dp, XFS_ILOG_CORE);
|
|
|
|
/*
|
|
* If this is a synchronous mount, make sure that the
|
|
* symlink transaction goes to disk before returning to
|
|
* the user.
|
|
*/
|
|
if (xfs_has_wsync(mp) || xfs_has_dirsync(mp))
|
|
xfs_trans_set_sync(tp);
|
|
|
|
error = xfs_trans_commit(tp);
|
|
if (error)
|
|
goto out_release_inode;
|
|
|
|
xfs_qm_dqrele(udqp);
|
|
xfs_qm_dqrele(gdqp);
|
|
xfs_qm_dqrele(pdqp);
|
|
|
|
*ipp = ip;
|
|
return 0;
|
|
|
|
out_trans_cancel:
|
|
xfs_trans_cancel(tp);
|
|
out_release_inode:
|
|
/*
|
|
* Wait until after the current transaction is aborted to finish the
|
|
* setup of the inode and release the inode. This prevents recursive
|
|
* transactions and deadlocks from xfs_inactive.
|
|
*/
|
|
if (ip) {
|
|
xfs_finish_inode_setup(ip);
|
|
xfs_irele(ip);
|
|
}
|
|
out_release_dquots:
|
|
xfs_qm_dqrele(udqp);
|
|
xfs_qm_dqrele(gdqp);
|
|
xfs_qm_dqrele(pdqp);
|
|
|
|
if (unlock_dp_on_error)
|
|
xfs_iunlock(dp, XFS_ILOCK_EXCL);
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* Free a symlink that has blocks associated with it.
|
|
*
|
|
* Note: zero length symlinks are not allowed to exist. When we set the size to
|
|
* zero, also change it to a regular file so that it does not get written to
|
|
* disk as a zero length symlink. The inode is on the unlinked list already, so
|
|
* userspace cannot find this inode anymore, so this change is not user visible
|
|
* but allows us to catch corrupt zero-length symlinks in the verifiers.
|
|
*/
|
|
STATIC int
|
|
xfs_inactive_symlink_rmt(
|
|
struct xfs_inode *ip)
|
|
{
|
|
struct xfs_buf *bp;
|
|
int done;
|
|
int error;
|
|
int i;
|
|
xfs_mount_t *mp;
|
|
xfs_bmbt_irec_t mval[XFS_SYMLINK_MAPS];
|
|
int nmaps;
|
|
int size;
|
|
xfs_trans_t *tp;
|
|
|
|
mp = ip->i_mount;
|
|
ASSERT(!xfs_need_iread_extents(&ip->i_df));
|
|
/*
|
|
* We're freeing a symlink that has some
|
|
* blocks allocated to it. Free the
|
|
* blocks here. We know that we've got
|
|
* either 1 or 2 extents and that we can
|
|
* free them all in one bunmapi call.
|
|
*/
|
|
ASSERT(ip->i_df.if_nextents > 0 && ip->i_df.if_nextents <= 2);
|
|
|
|
error = xfs_trans_alloc(mp, &M_RES(mp)->tr_itruncate, 0, 0, 0, &tp);
|
|
if (error)
|
|
return error;
|
|
|
|
xfs_ilock(ip, XFS_ILOCK_EXCL);
|
|
xfs_trans_ijoin(tp, ip, 0);
|
|
|
|
/*
|
|
* Lock the inode, fix the size, turn it into a regular file and join it
|
|
* to the transaction. Hold it so in the normal path, we still have it
|
|
* locked for the second transaction. In the error paths we need it
|
|
* held so the cancel won't rele it, see below.
|
|
*/
|
|
size = (int)ip->i_disk_size;
|
|
ip->i_disk_size = 0;
|
|
VFS_I(ip)->i_mode = (VFS_I(ip)->i_mode & ~S_IFMT) | S_IFREG;
|
|
xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
|
|
/*
|
|
* Find the block(s) so we can inval and unmap them.
|
|
*/
|
|
done = 0;
|
|
nmaps = ARRAY_SIZE(mval);
|
|
error = xfs_bmapi_read(ip, 0, xfs_symlink_blocks(mp, size),
|
|
mval, &nmaps, 0);
|
|
if (error)
|
|
goto error_trans_cancel;
|
|
/*
|
|
* Invalidate the block(s). No validation is done.
|
|
*/
|
|
for (i = 0; i < nmaps; i++) {
|
|
error = xfs_trans_get_buf(tp, mp->m_ddev_targp,
|
|
XFS_FSB_TO_DADDR(mp, mval[i].br_startblock),
|
|
XFS_FSB_TO_BB(mp, mval[i].br_blockcount), 0,
|
|
&bp);
|
|
if (error)
|
|
goto error_trans_cancel;
|
|
xfs_trans_binval(tp, bp);
|
|
}
|
|
/*
|
|
* Unmap the dead block(s) to the dfops.
|
|
*/
|
|
error = xfs_bunmapi(tp, ip, 0, size, 0, nmaps, &done);
|
|
if (error)
|
|
goto error_trans_cancel;
|
|
ASSERT(done);
|
|
|
|
/*
|
|
* Commit the transaction. This first logs the EFI and the inode, then
|
|
* rolls and commits the transaction that frees the extents.
|
|
*/
|
|
xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
|
|
error = xfs_trans_commit(tp);
|
|
if (error) {
|
|
ASSERT(xfs_is_shutdown(mp));
|
|
goto error_unlock;
|
|
}
|
|
|
|
/*
|
|
* Remove the memory for extent descriptions (just bookkeeping).
|
|
*/
|
|
if (ip->i_df.if_bytes)
|
|
xfs_idata_realloc(ip, -ip->i_df.if_bytes, XFS_DATA_FORK);
|
|
ASSERT(ip->i_df.if_bytes == 0);
|
|
|
|
xfs_iunlock(ip, XFS_ILOCK_EXCL);
|
|
return 0;
|
|
|
|
error_trans_cancel:
|
|
xfs_trans_cancel(tp);
|
|
error_unlock:
|
|
xfs_iunlock(ip, XFS_ILOCK_EXCL);
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* xfs_inactive_symlink - free a symlink
|
|
*/
|
|
int
|
|
xfs_inactive_symlink(
|
|
struct xfs_inode *ip)
|
|
{
|
|
struct xfs_mount *mp = ip->i_mount;
|
|
int pathlen;
|
|
|
|
trace_xfs_inactive_symlink(ip);
|
|
|
|
if (xfs_is_shutdown(mp))
|
|
return -EIO;
|
|
|
|
xfs_ilock(ip, XFS_ILOCK_EXCL);
|
|
pathlen = (int)ip->i_disk_size;
|
|
ASSERT(pathlen);
|
|
|
|
if (pathlen <= 0 || pathlen > XFS_SYMLINK_MAXLEN) {
|
|
xfs_alert(mp, "%s: inode (0x%llx) bad symlink length (%d)",
|
|
__func__, (unsigned long long)ip->i_ino, pathlen);
|
|
xfs_iunlock(ip, XFS_ILOCK_EXCL);
|
|
ASSERT(0);
|
|
return -EFSCORRUPTED;
|
|
}
|
|
|
|
/*
|
|
* Inline fork state gets removed by xfs_difree() so we have nothing to
|
|
* do here in that case.
|
|
*/
|
|
if (ip->i_df.if_format == XFS_DINODE_FMT_LOCAL) {
|
|
xfs_iunlock(ip, XFS_ILOCK_EXCL);
|
|
return 0;
|
|
}
|
|
|
|
xfs_iunlock(ip, XFS_ILOCK_EXCL);
|
|
|
|
/* remove the remote symlink */
|
|
return xfs_inactive_symlink_rmt(ip);
|
|
}
|