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linux/fs/xfs/xfs_attr.c
Christoph Hellwig 3542c6e18f [PATCH] remove xfs xattr permission checks 
remove checks now in the VFS

XFS has an additional xattr interface through obscure ioctl.  it requires
raised capabilities but we need to add some read-only/immutable checks anyway

Signed-off-by: Christoph Hellwig <hch@lst.de>
Cc: Nathan Scott <nathans@sgi.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-01-10 08:01:30 -08:00

2641 lines
68 KiB
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/*
* Copyright (c) 2000-2005 Silicon Graphics, Inc.
* All Rights Reserved.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it would be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "xfs.h"
#include "xfs_fs.h"
#include "xfs_types.h"
#include "xfs_bit.h"
#include "xfs_log.h"
#include "xfs_inum.h"
#include "xfs_trans.h"
#include "xfs_sb.h"
#include "xfs_ag.h"
#include "xfs_dir.h"
#include "xfs_dir2.h"
#include "xfs_dmapi.h"
#include "xfs_mount.h"
#include "xfs_da_btree.h"
#include "xfs_bmap_btree.h"
#include "xfs_alloc_btree.h"
#include "xfs_ialloc_btree.h"
#include "xfs_dir_sf.h"
#include "xfs_dir2_sf.h"
#include "xfs_attr_sf.h"
#include "xfs_dinode.h"
#include "xfs_inode.h"
#include "xfs_alloc.h"
#include "xfs_btree.h"
#include "xfs_inode_item.h"
#include "xfs_bmap.h"
#include "xfs_attr.h"
#include "xfs_attr_leaf.h"
#include "xfs_error.h"
#include "xfs_quota.h"
#include "xfs_trans_space.h"
#include "xfs_acl.h"
#include "xfs_rw.h"
/*
* xfs_attr.c
*
* Provide the external interfaces to manage attribute lists.
*/
#define ATTR_SYSCOUNT 2
STATIC struct attrnames posix_acl_access;
STATIC struct attrnames posix_acl_default;
STATIC struct attrnames *attr_system_names[ATTR_SYSCOUNT];
/*========================================================================
* Function prototypes for the kernel.
*========================================================================*/
/*
* Internal routines when attribute list fits inside the inode.
*/
STATIC int xfs_attr_shortform_addname(xfs_da_args_t *args);
/*
* Internal routines when attribute list is one block.
*/
STATIC int xfs_attr_leaf_get(xfs_da_args_t *args);
STATIC int xfs_attr_leaf_addname(xfs_da_args_t *args);
STATIC int xfs_attr_leaf_removename(xfs_da_args_t *args);
STATIC int xfs_attr_leaf_list(xfs_attr_list_context_t *context);
/*
* Internal routines when attribute list is more than one block.
*/
STATIC int xfs_attr_node_get(xfs_da_args_t *args);
STATIC int xfs_attr_node_addname(xfs_da_args_t *args);
STATIC int xfs_attr_node_removename(xfs_da_args_t *args);
STATIC int xfs_attr_node_list(xfs_attr_list_context_t *context);
STATIC int xfs_attr_fillstate(xfs_da_state_t *state);
STATIC int xfs_attr_refillstate(xfs_da_state_t *state);
/*
* Routines to manipulate out-of-line attribute values.
*/
STATIC int xfs_attr_rmtval_get(xfs_da_args_t *args);
STATIC int xfs_attr_rmtval_set(xfs_da_args_t *args);
STATIC int xfs_attr_rmtval_remove(xfs_da_args_t *args);
#define ATTR_RMTVALUE_MAPSIZE 1 /* # of map entries at once */
#if defined(XFS_ATTR_TRACE)
ktrace_t *xfs_attr_trace_buf;
#endif
/*========================================================================
* Overall external interface routines.
*========================================================================*/
int
xfs_attr_fetch(xfs_inode_t *ip, const char *name, int namelen,
char *value, int *valuelenp, int flags, struct cred *cred)
{
xfs_da_args_t args;
int error;
if ((XFS_IFORK_Q(ip) == 0) ||
(ip->i_d.di_aformat == XFS_DINODE_FMT_EXTENTS &&
ip->i_d.di_anextents == 0))
return(ENOATTR);
/*
* Fill in the arg structure for this request.
*/
memset((char *)&args, 0, sizeof(args));
args.name = name;
args.namelen = namelen;
args.value = value;
args.valuelen = *valuelenp;
args.flags = flags;
args.hashval = xfs_da_hashname(args.name, args.namelen);
args.dp = ip;
args.whichfork = XFS_ATTR_FORK;
/*
* Decide on what work routines to call based on the inode size.
*/
if (XFS_IFORK_Q(ip) == 0 ||
(ip->i_d.di_aformat == XFS_DINODE_FMT_EXTENTS &&
ip->i_d.di_anextents == 0)) {
error = XFS_ERROR(ENOATTR);
} else if (ip->i_d.di_aformat == XFS_DINODE_FMT_LOCAL) {
error = xfs_attr_shortform_getvalue(&args);
} else if (xfs_bmap_one_block(ip, XFS_ATTR_FORK)) {
error = xfs_attr_leaf_get(&args);
} else {
error = xfs_attr_node_get(&args);
}
/*
* Return the number of bytes in the value to the caller.
*/
*valuelenp = args.valuelen;
if (error == EEXIST)
error = 0;
return(error);
}
int
xfs_attr_get(bhv_desc_t *bdp, const char *name, char *value, int *valuelenp,
int flags, struct cred *cred)
{
xfs_inode_t *ip = XFS_BHVTOI(bdp);
int error, namelen;
XFS_STATS_INC(xs_attr_get);
if (!name)
return(EINVAL);
namelen = strlen(name);
if (namelen >= MAXNAMELEN)
return(EFAULT); /* match IRIX behaviour */
if (XFS_FORCED_SHUTDOWN(ip->i_mount))
return(EIO);
xfs_ilock(ip, XFS_ILOCK_SHARED);
error = xfs_attr_fetch(ip, name, namelen, value, valuelenp, flags, cred);
xfs_iunlock(ip, XFS_ILOCK_SHARED);
return(error);
}
STATIC int
xfs_attr_set_int(xfs_inode_t *dp, const char *name, int namelen,
char *value, int valuelen, int flags)
{
xfs_da_args_t args;
xfs_fsblock_t firstblock;
xfs_bmap_free_t flist;
int error, err2, committed;
int local, size;
uint nblks;
xfs_mount_t *mp = dp->i_mount;
int rsvd = (flags & ATTR_ROOT) != 0;
/*
* Attach the dquots to the inode.
*/
if ((error = XFS_QM_DQATTACH(mp, dp, 0)))
return (error);
/*
* Determine space new attribute will use, and if it would be
* "local" or "remote" (note: local != inline).
*/
size = xfs_attr_leaf_newentsize(namelen, valuelen,
mp->m_sb.sb_blocksize, &local);
/*
* If the inode doesn't have an attribute fork, add one.
* (inode must not be locked when we call this routine)
*/
if (XFS_IFORK_Q(dp) == 0) {
if ((error = xfs_bmap_add_attrfork(dp, size, rsvd)))
return(error);
}
/*
* Fill in the arg structure for this request.
*/
memset((char *)&args, 0, sizeof(args));
args.name = name;
args.namelen = namelen;
args.value = value;
args.valuelen = valuelen;
args.flags = flags;
args.hashval = xfs_da_hashname(args.name, args.namelen);
args.dp = dp;
args.firstblock = &firstblock;
args.flist = &flist;
args.whichfork = XFS_ATTR_FORK;
args.addname = 1;
args.oknoent = 1;
nblks = XFS_DAENTER_SPACE_RES(mp, XFS_ATTR_FORK);
if (local) {
if (size > (mp->m_sb.sb_blocksize >> 1)) {
/* Double split possible */
nblks <<= 1;
}
} else {
uint dblocks = XFS_B_TO_FSB(mp, valuelen);
/* Out of line attribute, cannot double split, but make
* room for the attribute value itself.
*/
nblks += dblocks;
nblks += XFS_NEXTENTADD_SPACE_RES(mp, dblocks, XFS_ATTR_FORK);
}
/* Size is now blocks for attribute data */
args.total = nblks;
/*
* Start our first transaction of the day.
*
* All future transactions during this code must be "chained" off
* this one via the trans_dup() call. All transactions will contain
* the inode, and the inode will always be marked with trans_ihold().
* Since the inode will be locked in all transactions, we must log
* the inode in every transaction to let it float upward through
* the log.
*/
args.trans = xfs_trans_alloc(mp, XFS_TRANS_ATTR_SET);
/*
* Root fork attributes can use reserved data blocks for this
* operation if necessary
*/
if (rsvd)
args.trans->t_flags |= XFS_TRANS_RESERVE;
if ((error = xfs_trans_reserve(args.trans, (uint) nblks,
XFS_ATTRSET_LOG_RES(mp, nblks),
0, XFS_TRANS_PERM_LOG_RES,
XFS_ATTRSET_LOG_COUNT))) {
xfs_trans_cancel(args.trans, 0);
return(error);
}
xfs_ilock(dp, XFS_ILOCK_EXCL);
error = XFS_TRANS_RESERVE_QUOTA_NBLKS(mp, args.trans, dp, nblks, 0,
rsvd ? XFS_QMOPT_RES_REGBLKS | XFS_QMOPT_FORCE_RES :
XFS_QMOPT_RES_REGBLKS);
if (error) {
xfs_iunlock(dp, XFS_ILOCK_EXCL);
xfs_trans_cancel(args.trans, XFS_TRANS_RELEASE_LOG_RES);
return (error);
}
xfs_trans_ijoin(args.trans, dp, XFS_ILOCK_EXCL);
xfs_trans_ihold(args.trans, dp);
/*
* If the attribute list is non-existant or a shortform list,
* upgrade it to a single-leaf-block attribute list.
*/
if ((dp->i_d.di_aformat == XFS_DINODE_FMT_LOCAL) ||
((dp->i_d.di_aformat == XFS_DINODE_FMT_EXTENTS) &&
(dp->i_d.di_anextents == 0))) {
/*
* Build initial attribute list (if required).
*/
if (dp->i_d.di_aformat == XFS_DINODE_FMT_EXTENTS)
xfs_attr_shortform_create(&args);
/*
* Try to add the attr to the attribute list in
* the inode.
*/
error = xfs_attr_shortform_addname(&args);
if (error != ENOSPC) {
/*
* Commit the shortform mods, and we're done.
* NOTE: this is also the error path (EEXIST, etc).
*/
ASSERT(args.trans != NULL);
/*
* If this is a synchronous mount, make sure that
* the transaction goes to disk before returning
* to the user.
*/
if (mp->m_flags & XFS_MOUNT_WSYNC) {
xfs_trans_set_sync(args.trans);
}
err2 = xfs_trans_commit(args.trans,
XFS_TRANS_RELEASE_LOG_RES,
NULL);
xfs_iunlock(dp, XFS_ILOCK_EXCL);
/*
* Hit the inode change time.
*/
if (!error && (flags & ATTR_KERNOTIME) == 0) {
xfs_ichgtime(dp, XFS_ICHGTIME_CHG);
}
return(error == 0 ? err2 : error);
}
/*
* It won't fit in the shortform, transform to a leaf block.
* GROT: another possible req'mt for a double-split btree op.
*/
XFS_BMAP_INIT(args.flist, args.firstblock);
error = xfs_attr_shortform_to_leaf(&args);
if (!error) {
error = xfs_bmap_finish(&args.trans, args.flist,
*args.firstblock, &committed);
}
if (error) {
ASSERT(committed);
args.trans = NULL;
xfs_bmap_cancel(&flist);
goto out;
}
/*
* bmap_finish() may have committed the last trans and started
* a new one. We need the inode to be in all transactions.
*/
if (committed) {
xfs_trans_ijoin(args.trans, dp, XFS_ILOCK_EXCL);
xfs_trans_ihold(args.trans, dp);
}
/*
* Commit the leaf transformation. We'll need another (linked)
* transaction to add the new attribute to the leaf.
*/
if ((error = xfs_attr_rolltrans(&args.trans, dp)))
goto out;
}
if (xfs_bmap_one_block(dp, XFS_ATTR_FORK)) {
error = xfs_attr_leaf_addname(&args);
} else {
error = xfs_attr_node_addname(&args);
}
if (error) {
goto out;
}
/*
* If this is a synchronous mount, make sure that the
* transaction goes to disk before returning to the user.
*/
if (mp->m_flags & XFS_MOUNT_WSYNC) {
xfs_trans_set_sync(args.trans);
}
/*
* Commit the last in the sequence of transactions.
*/
xfs_trans_log_inode(args.trans, dp, XFS_ILOG_CORE);
error = xfs_trans_commit(args.trans, XFS_TRANS_RELEASE_LOG_RES,
NULL);
xfs_iunlock(dp, XFS_ILOCK_EXCL);
/*
* Hit the inode change time.
*/
if (!error && (flags & ATTR_KERNOTIME) == 0) {
xfs_ichgtime(dp, XFS_ICHGTIME_CHG);
}
return(error);
out:
if (args.trans)
xfs_trans_cancel(args.trans,
XFS_TRANS_RELEASE_LOG_RES|XFS_TRANS_ABORT);
xfs_iunlock(dp, XFS_ILOCK_EXCL);
return(error);
}
int
xfs_attr_set(bhv_desc_t *bdp, const char *name, char *value, int valuelen, int flags,
struct cred *cred)
{
xfs_inode_t *dp;
int namelen;
namelen = strlen(name);
if (namelen >= MAXNAMELEN)
return EFAULT; /* match IRIX behaviour */
XFS_STATS_INC(xs_attr_set);
dp = XFS_BHVTOI(bdp);
if (XFS_FORCED_SHUTDOWN(dp->i_mount))
return (EIO);
return xfs_attr_set_int(dp, name, namelen, value, valuelen, flags);
}
/*
* Generic handler routine to remove a name from an attribute list.
* Transitions attribute list from Btree to shortform as necessary.
*/
STATIC int
xfs_attr_remove_int(xfs_inode_t *dp, const char *name, int namelen, int flags)
{
xfs_da_args_t args;
xfs_fsblock_t firstblock;
xfs_bmap_free_t flist;
int error;
xfs_mount_t *mp = dp->i_mount;
/*
* Fill in the arg structure for this request.
*/
memset((char *)&args, 0, sizeof(args));
args.name = name;
args.namelen = namelen;
args.flags = flags;
args.hashval = xfs_da_hashname(args.name, args.namelen);
args.dp = dp;
args.firstblock = &firstblock;
args.flist = &flist;
args.total = 0;
args.whichfork = XFS_ATTR_FORK;
/*
* Attach the dquots to the inode.
*/
if ((error = XFS_QM_DQATTACH(mp, dp, 0)))
return (error);
/*
* Start our first transaction of the day.
*
* All future transactions during this code must be "chained" off
* this one via the trans_dup() call. All transactions will contain
* the inode, and the inode will always be marked with trans_ihold().
* Since the inode will be locked in all transactions, we must log
* the inode in every transaction to let it float upward through
* the log.
*/
args.trans = xfs_trans_alloc(mp, XFS_TRANS_ATTR_RM);
/*
* Root fork attributes can use reserved data blocks for this
* operation if necessary
*/
if (flags & ATTR_ROOT)
args.trans->t_flags |= XFS_TRANS_RESERVE;
if ((error = xfs_trans_reserve(args.trans,
XFS_ATTRRM_SPACE_RES(mp),
XFS_ATTRRM_LOG_RES(mp),
0, XFS_TRANS_PERM_LOG_RES,
XFS_ATTRRM_LOG_COUNT))) {
xfs_trans_cancel(args.trans, 0);
return(error);
}
xfs_ilock(dp, XFS_ILOCK_EXCL);
/*
* No need to make quota reservations here. We expect to release some
* blocks not allocate in the common case.
*/
xfs_trans_ijoin(args.trans, dp, XFS_ILOCK_EXCL);
xfs_trans_ihold(args.trans, dp);
/*
* Decide on what work routines to call based on the inode size.
*/
if (XFS_IFORK_Q(dp) == 0 ||
(dp->i_d.di_aformat == XFS_DINODE_FMT_EXTENTS &&
dp->i_d.di_anextents == 0)) {
error = XFS_ERROR(ENOATTR);
goto out;
}
if (dp->i_d.di_aformat == XFS_DINODE_FMT_LOCAL) {
ASSERT(dp->i_afp->if_flags & XFS_IFINLINE);
error = xfs_attr_shortform_remove(&args);
if (error) {
goto out;
}
} else if (xfs_bmap_one_block(dp, XFS_ATTR_FORK)) {
error = xfs_attr_leaf_removename(&args);
} else {
error = xfs_attr_node_removename(&args);
}
if (error) {
goto out;
}
/*
* If this is a synchronous mount, make sure that the
* transaction goes to disk before returning to the user.
*/
if (mp->m_flags & XFS_MOUNT_WSYNC) {
xfs_trans_set_sync(args.trans);
}
/*
* Commit the last in the sequence of transactions.
*/
xfs_trans_log_inode(args.trans, dp, XFS_ILOG_CORE);
error = xfs_trans_commit(args.trans, XFS_TRANS_RELEASE_LOG_RES,
NULL);
xfs_iunlock(dp, XFS_ILOCK_EXCL);
/*
* Hit the inode change time.
*/
if (!error && (flags & ATTR_KERNOTIME) == 0) {
xfs_ichgtime(dp, XFS_ICHGTIME_CHG);
}
return(error);
out:
if (args.trans)
xfs_trans_cancel(args.trans,
XFS_TRANS_RELEASE_LOG_RES|XFS_TRANS_ABORT);
xfs_iunlock(dp, XFS_ILOCK_EXCL);
return(error);
}
int
xfs_attr_remove(bhv_desc_t *bdp, const char *name, int flags, struct cred *cred)
{
xfs_inode_t *dp;
int namelen;
namelen = strlen(name);
if (namelen >= MAXNAMELEN)
return EFAULT; /* match IRIX behaviour */
XFS_STATS_INC(xs_attr_remove);
dp = XFS_BHVTOI(bdp);
if (XFS_FORCED_SHUTDOWN(dp->i_mount))
return (EIO);
xfs_ilock(dp, XFS_ILOCK_SHARED);
if (XFS_IFORK_Q(dp) == 0 ||
(dp->i_d.di_aformat == XFS_DINODE_FMT_EXTENTS &&
dp->i_d.di_anextents == 0)) {
xfs_iunlock(dp, XFS_ILOCK_SHARED);
return(XFS_ERROR(ENOATTR));
}
xfs_iunlock(dp, XFS_ILOCK_SHARED);
return xfs_attr_remove_int(dp, name, namelen, flags);
}
/*
* Generate a list of extended attribute names and optionally
* also value lengths. Positive return value follows the XFS
* convention of being an error, zero or negative return code
* is the length of the buffer returned (negated), indicating
* success.
*/
int
xfs_attr_list(bhv_desc_t *bdp, char *buffer, int bufsize, int flags,
attrlist_cursor_kern_t *cursor, struct cred *cred)
{
xfs_attr_list_context_t context;
xfs_inode_t *dp;
int error;
XFS_STATS_INC(xs_attr_list);
/*
* Validate the cursor.
*/
if (cursor->pad1 || cursor->pad2)
return(XFS_ERROR(EINVAL));
if ((cursor->initted == 0) &&
(cursor->hashval || cursor->blkno || cursor->offset))
return(XFS_ERROR(EINVAL));
/*
* Check for a properly aligned buffer.
*/
if (((long)buffer) & (sizeof(int)-1))
return(XFS_ERROR(EFAULT));
if (flags & ATTR_KERNOVAL)
bufsize = 0;
/*
* Initialize the output buffer.
*/
context.dp = dp = XFS_BHVTOI(bdp);
context.cursor = cursor;
context.count = 0;
context.dupcnt = 0;
context.resynch = 1;
context.flags = flags;
if (!(flags & ATTR_KERNAMELS)) {
context.bufsize = (bufsize & ~(sizeof(int)-1)); /* align */
context.firstu = context.bufsize;
context.alist = (attrlist_t *)buffer;
context.alist->al_count = 0;
context.alist->al_more = 0;
context.alist->al_offset[0] = context.bufsize;
}
else {
context.bufsize = bufsize;
context.firstu = context.bufsize;
context.alist = (attrlist_t *)buffer;
}
if (XFS_FORCED_SHUTDOWN(dp->i_mount))
return (EIO);
xfs_ilock(dp, XFS_ILOCK_SHARED);
/*
* Decide on what work routines to call based on the inode size.
*/
xfs_attr_trace_l_c("syscall start", &context);
if (XFS_IFORK_Q(dp) == 0 ||
(dp->i_d.di_aformat == XFS_DINODE_FMT_EXTENTS &&
dp->i_d.di_anextents == 0)) {
error = 0;
} else if (dp->i_d.di_aformat == XFS_DINODE_FMT_LOCAL) {
error = xfs_attr_shortform_list(&context);
} else if (xfs_bmap_one_block(dp, XFS_ATTR_FORK)) {
error = xfs_attr_leaf_list(&context);
} else {
error = xfs_attr_node_list(&context);
}
xfs_iunlock(dp, XFS_ILOCK_SHARED);
xfs_attr_trace_l_c("syscall end", &context);
if (!(context.flags & (ATTR_KERNOVAL|ATTR_KERNAMELS))) {
ASSERT(error >= 0);
}
else { /* must return negated buffer size or the error */
if (context.count < 0)
error = XFS_ERROR(ERANGE);
else
error = -context.count;
}
return(error);
}
int /* error */
xfs_attr_inactive(xfs_inode_t *dp)
{
xfs_trans_t *trans;
xfs_mount_t *mp;
int error;
mp = dp->i_mount;
ASSERT(! XFS_NOT_DQATTACHED(mp, dp));
xfs_ilock(dp, XFS_ILOCK_SHARED);
if ((XFS_IFORK_Q(dp) == 0) ||
(dp->i_d.di_aformat == XFS_DINODE_FMT_LOCAL) ||
(dp->i_d.di_aformat == XFS_DINODE_FMT_EXTENTS &&
dp->i_d.di_anextents == 0)) {
xfs_iunlock(dp, XFS_ILOCK_SHARED);
return(0);
}
xfs_iunlock(dp, XFS_ILOCK_SHARED);
/*
* Start our first transaction of the day.
*
* All future transactions during this code must be "chained" off
* this one via the trans_dup() call. All transactions will contain
* the inode, and the inode will always be marked with trans_ihold().
* Since the inode will be locked in all transactions, we must log
* the inode in every transaction to let it float upward through
* the log.
*/
trans = xfs_trans_alloc(mp, XFS_TRANS_ATTRINVAL);
if ((error = xfs_trans_reserve(trans, 0, XFS_ATTRINVAL_LOG_RES(mp), 0,
XFS_TRANS_PERM_LOG_RES,
XFS_ATTRINVAL_LOG_COUNT))) {
xfs_trans_cancel(trans, 0);
return(error);
}
xfs_ilock(dp, XFS_ILOCK_EXCL);
/*
* No need to make quota reservations here. We expect to release some
* blocks, not allocate, in the common case.
*/
xfs_trans_ijoin(trans, dp, XFS_ILOCK_EXCL);
xfs_trans_ihold(trans, dp);
/*
* Decide on what work routines to call based on the inode size.
*/
if ((XFS_IFORK_Q(dp) == 0) ||
(dp->i_d.di_aformat == XFS_DINODE_FMT_LOCAL) ||
(dp->i_d.di_aformat == XFS_DINODE_FMT_EXTENTS &&
dp->i_d.di_anextents == 0)) {
error = 0;
goto out;
}
error = xfs_attr_root_inactive(&trans, dp);
if (error)
goto out;
/*
* signal synchronous inactive transactions unless this
* is a synchronous mount filesystem in which case we
* know that we're here because we've been called out of
* xfs_inactive which means that the last reference is gone
* and the unlink transaction has already hit the disk so
* async inactive transactions are safe.
*/
if ((error = xfs_itruncate_finish(&trans, dp, 0LL, XFS_ATTR_FORK,
(!(mp->m_flags & XFS_MOUNT_WSYNC)
? 1 : 0))))
goto out;
/*
* Commit the last in the sequence of transactions.
*/
xfs_trans_log_inode(trans, dp, XFS_ILOG_CORE);
error = xfs_trans_commit(trans, XFS_TRANS_RELEASE_LOG_RES,
NULL);
xfs_iunlock(dp, XFS_ILOCK_EXCL);
return(error);
out:
xfs_trans_cancel(trans, XFS_TRANS_RELEASE_LOG_RES|XFS_TRANS_ABORT);
xfs_iunlock(dp, XFS_ILOCK_EXCL);
return(error);
}
/*========================================================================
* External routines when attribute list is inside the inode
*========================================================================*/
/*
* Add a name to the shortform attribute list structure
* This is the external routine.
*/
STATIC int
xfs_attr_shortform_addname(xfs_da_args_t *args)
{
int newsize, forkoff, retval;
retval = xfs_attr_shortform_lookup(args);
if ((args->flags & ATTR_REPLACE) && (retval == ENOATTR)) {
return(retval);
} else if (retval == EEXIST) {
if (args->flags & ATTR_CREATE)
return(retval);
retval = xfs_attr_shortform_remove(args);
ASSERT(retval == 0);
}
if (args->namelen >= XFS_ATTR_SF_ENTSIZE_MAX ||
args->valuelen >= XFS_ATTR_SF_ENTSIZE_MAX)
return(XFS_ERROR(ENOSPC));
newsize = XFS_ATTR_SF_TOTSIZE(args->dp);
newsize += XFS_ATTR_SF_ENTSIZE_BYNAME(args->namelen, args->valuelen);
forkoff = xfs_attr_shortform_bytesfit(args->dp, newsize);
if (!forkoff)
return(XFS_ERROR(ENOSPC));
xfs_attr_shortform_add(args, forkoff);
return(0);
}
/*========================================================================
* External routines when attribute list is one block
*========================================================================*/
/*
* Add a name to the leaf attribute list structure
*
* This leaf block cannot have a "remote" value, we only call this routine
* if bmap_one_block() says there is only one block (ie: no remote blks).
*/
int
xfs_attr_leaf_addname(xfs_da_args_t *args)
{
xfs_inode_t *dp;
xfs_dabuf_t *bp;
int retval, error, committed, forkoff;
/*
* Read the (only) block in the attribute list in.
*/
dp = args->dp;
args->blkno = 0;
error = xfs_da_read_buf(args->trans, args->dp, args->blkno, -1, &bp,
XFS_ATTR_FORK);
if (error)
return(error);
ASSERT(bp != NULL);
/*
* Look up the given attribute in the leaf block. Figure out if
* the given flags produce an error or call for an atomic rename.
*/
retval = xfs_attr_leaf_lookup_int(bp, args);
if ((args->flags & ATTR_REPLACE) && (retval == ENOATTR)) {
xfs_da_brelse(args->trans, bp);
return(retval);
} else if (retval == EEXIST) {
if (args->flags & ATTR_CREATE) { /* pure create op */
xfs_da_brelse(args->trans, bp);
return(retval);
}
args->rename = 1; /* an atomic rename */
args->blkno2 = args->blkno; /* set 2nd entry info*/
args->index2 = args->index;
args->rmtblkno2 = args->rmtblkno;
args->rmtblkcnt2 = args->rmtblkcnt;
}
/*
* Add the attribute to the leaf block, transitioning to a Btree
* if required.
*/
retval = xfs_attr_leaf_add(bp, args);
xfs_da_buf_done(bp);
if (retval == ENOSPC) {
/*
* Promote the attribute list to the Btree format, then
* Commit that transaction so that the node_addname() call
* can manage its own transactions.
*/
XFS_BMAP_INIT(args->flist, args->firstblock);
error = xfs_attr_leaf_to_node(args);
if (!error) {
error = xfs_bmap_finish(&args->trans, args->flist,
*args->firstblock, &committed);
}
if (error) {
ASSERT(committed);
args->trans = NULL;
xfs_bmap_cancel(args->flist);
return(error);
}
/*
* bmap_finish() may have committed the last trans and started
* a new one. We need the inode to be in all transactions.
*/
if (committed) {
xfs_trans_ijoin(args->trans, dp, XFS_ILOCK_EXCL);
xfs_trans_ihold(args->trans, dp);
}
/*
* Commit the current trans (including the inode) and start
* a new one.
*/
if ((error = xfs_attr_rolltrans(&args->trans, dp)))
return (error);
/*
* Fob the whole rest of the problem off on the Btree code.
*/
error = xfs_attr_node_addname(args);
return(error);
}
/*
* Commit the transaction that added the attr name so that
* later routines can manage their own transactions.
*/
if ((error = xfs_attr_rolltrans(&args->trans, dp)))
return (error);
/*
* If there was an out-of-line value, allocate the blocks we
* identified for its storage and copy the value. This is done
* after we create the attribute so that we don't overflow the
* maximum size of a transaction and/or hit a deadlock.
*/
if (args->rmtblkno > 0) {
error = xfs_attr_rmtval_set(args);
if (error)
return(error);
}
/*
* If this is an atomic rename operation, we must "flip" the
* incomplete flags on the "new" and "old" attribute/value pairs
* so that one disappears and one appears atomically. Then we
* must remove the "old" attribute/value pair.
*/
if (args->rename) {
/*
* In a separate transaction, set the incomplete flag on the
* "old" attr and clear the incomplete flag on the "new" attr.
*/
error = xfs_attr_leaf_flipflags(args);
if (error)
return(error);
/*
* Dismantle the "old" attribute/value pair by removing
* a "remote" value (if it exists).
*/
args->index = args->index2;
args->blkno = args->blkno2;
args->rmtblkno = args->rmtblkno2;
args->rmtblkcnt = args->rmtblkcnt2;
if (args->rmtblkno) {
error = xfs_attr_rmtval_remove(args);
if (error)
return(error);
}
/*
* Read in the block containing the "old" attr, then
* remove the "old" attr from that block (neat, huh!)
*/
error = xfs_da_read_buf(args->trans, args->dp, args->blkno, -1,
&bp, XFS_ATTR_FORK);
if (error)
return(error);
ASSERT(bp != NULL);
(void)xfs_attr_leaf_remove(bp, args);
/*
* If the result is small enough, shrink it all into the inode.
*/
if ((forkoff = xfs_attr_shortform_allfit(bp, dp))) {
XFS_BMAP_INIT(args->flist, args->firstblock);
error = xfs_attr_leaf_to_shortform(bp, args, forkoff);
/* bp is gone due to xfs_da_shrink_inode */
if (!error) {
error = xfs_bmap_finish(&args->trans,
args->flist,
*args->firstblock,
&committed);
}
if (error) {
ASSERT(committed);
args->trans = NULL;
xfs_bmap_cancel(args->flist);
return(error);
}
/*
* bmap_finish() may have committed the last trans
* and started a new one. We need the inode to be
* in all transactions.
*/
if (committed) {
xfs_trans_ijoin(args->trans, dp, XFS_ILOCK_EXCL);
xfs_trans_ihold(args->trans, dp);
}
} else
xfs_da_buf_done(bp);
/*
* Commit the remove and start the next trans in series.
*/
error = xfs_attr_rolltrans(&args->trans, dp);
} else if (args->rmtblkno > 0) {
/*
* Added a "remote" value, just clear the incomplete flag.
*/
error = xfs_attr_leaf_clearflag(args);
}
return(error);
}
/*
* Remove a name from the leaf attribute list structure
*
* This leaf block cannot have a "remote" value, we only call this routine
* if bmap_one_block() says there is only one block (ie: no remote blks).
*/
STATIC int
xfs_attr_leaf_removename(xfs_da_args_t *args)
{
xfs_inode_t *dp;
xfs_dabuf_t *bp;
int error, committed, forkoff;
/*
* Remove the attribute.
*/
dp = args->dp;
args->blkno = 0;
error = xfs_da_read_buf(args->trans, args->dp, args->blkno, -1, &bp,
XFS_ATTR_FORK);
if (error) {
return(error);
}
ASSERT(bp != NULL);
error = xfs_attr_leaf_lookup_int(bp, args);
if (error == ENOATTR) {
xfs_da_brelse(args->trans, bp);
return(error);
}
(void)xfs_attr_leaf_remove(bp, args);
/*
* If the result is small enough, shrink it all into the inode.
*/
if ((forkoff = xfs_attr_shortform_allfit(bp, dp))) {
XFS_BMAP_INIT(args->flist, args->firstblock);
error = xfs_attr_leaf_to_shortform(bp, args, forkoff);
/* bp is gone due to xfs_da_shrink_inode */
if (!error) {
error = xfs_bmap_finish(&args->trans, args->flist,
*args->firstblock, &committed);
}
if (error) {
ASSERT(committed);
args->trans = NULL;
xfs_bmap_cancel(args->flist);
return(error);
}
/*
* bmap_finish() may have committed the last trans and started
* a new one. We need the inode to be in all transactions.
*/
if (committed) {
xfs_trans_ijoin(args->trans, dp, XFS_ILOCK_EXCL);
xfs_trans_ihold(args->trans, dp);
}
} else
xfs_da_buf_done(bp);
return(0);
}
/*
* Look up a name in a leaf attribute list structure.
*
* This leaf block cannot have a "remote" value, we only call this routine
* if bmap_one_block() says there is only one block (ie: no remote blks).
*/
STATIC int
xfs_attr_leaf_get(xfs_da_args_t *args)
{
xfs_dabuf_t *bp;
int error;
args->blkno = 0;
error = xfs_da_read_buf(args->trans, args->dp, args->blkno, -1, &bp,
XFS_ATTR_FORK);
if (error)
return(error);
ASSERT(bp != NULL);
error = xfs_attr_leaf_lookup_int(bp, args);
if (error != EEXIST) {
xfs_da_brelse(args->trans, bp);
return(error);
}
error = xfs_attr_leaf_getvalue(bp, args);
xfs_da_brelse(args->trans, bp);
if (!error && (args->rmtblkno > 0) && !(args->flags & ATTR_KERNOVAL)) {
error = xfs_attr_rmtval_get(args);
}
return(error);
}
/*
* Copy out attribute entries for attr_list(), for leaf attribute lists.
*/
STATIC int
xfs_attr_leaf_list(xfs_attr_list_context_t *context)
{
xfs_attr_leafblock_t *leaf;
int error;
xfs_dabuf_t *bp;
context->cursor->blkno = 0;
error = xfs_da_read_buf(NULL, context->dp, 0, -1, &bp, XFS_ATTR_FORK);
if (error)
return(error);
ASSERT(bp != NULL);
leaf = bp->data;
if (unlikely(INT_GET(leaf->hdr.info.magic, ARCH_CONVERT)
!= XFS_ATTR_LEAF_MAGIC)) {
XFS_CORRUPTION_ERROR("xfs_attr_leaf_list", XFS_ERRLEVEL_LOW,
context->dp->i_mount, leaf);
xfs_da_brelse(NULL, bp);
return(XFS_ERROR(EFSCORRUPTED));
}
(void)xfs_attr_leaf_list_int(bp, context);
xfs_da_brelse(NULL, bp);
return(0);
}
/*========================================================================
* External routines when attribute list size > XFS_LBSIZE(mp).
*========================================================================*/
/*
* Add a name to a Btree-format attribute list.
*
* This will involve walking down the Btree, and may involve splitting
* leaf nodes and even splitting intermediate nodes up to and including
* the root node (a special case of an intermediate node).
*
* "Remote" attribute values confuse the issue and atomic rename operations
* add a whole extra layer of confusion on top of that.
*/
STATIC int
xfs_attr_node_addname(xfs_da_args_t *args)
{
xfs_da_state_t *state;
xfs_da_state_blk_t *blk;
xfs_inode_t *dp;
xfs_mount_t *mp;
int committed, retval, error;
/*
* Fill in bucket of arguments/results/context to carry around.
*/
dp = args->dp;
mp = dp->i_mount;
restart:
state = xfs_da_state_alloc();
state->args = args;
state->mp = mp;
state->blocksize = state->mp->m_sb.sb_blocksize;
state->node_ents = state->mp->m_attr_node_ents;
/*
* Search to see if name already exists, and get back a pointer
* to where it should go.
*/
error = xfs_da_node_lookup_int(state, &retval);
if (error)
goto out;
blk = &state->path.blk[ state->path.active-1 ];
ASSERT(blk->magic == XFS_ATTR_LEAF_MAGIC);
if ((args->flags & ATTR_REPLACE) && (retval == ENOATTR)) {
goto out;
} else if (retval == EEXIST) {
if (args->flags & ATTR_CREATE)
goto out;
args->rename = 1; /* atomic rename op */
args->blkno2 = args->blkno; /* set 2nd entry info*/
args->index2 = args->index;
args->rmtblkno2 = args->rmtblkno;
args->rmtblkcnt2 = args->rmtblkcnt;
args->rmtblkno = 0;
args->rmtblkcnt = 0;
}
retval = xfs_attr_leaf_add(blk->bp, state->args);
if (retval == ENOSPC) {
if (state->path.active == 1) {
/*
* Its really a single leaf node, but it had
* out-of-line values so it looked like it *might*
* have been a b-tree.
*/
xfs_da_state_free(state);
XFS_BMAP_INIT(args->flist, args->firstblock);
error = xfs_attr_leaf_to_node(args);
if (!error) {
error = xfs_bmap_finish(&args->trans,
args->flist,
*args->firstblock,
&committed);
}
if (error) {
ASSERT(committed);
args->trans = NULL;
xfs_bmap_cancel(args->flist);
goto out;
}
/*
* bmap_finish() may have committed the last trans
* and started a new one. We need the inode to be
* in all transactions.
*/
if (committed) {
xfs_trans_ijoin(args->trans, dp, XFS_ILOCK_EXCL);
xfs_trans_ihold(args->trans, dp);
}
/*
* Commit the node conversion and start the next
* trans in the chain.
*/
if ((error = xfs_attr_rolltrans(&args->trans, dp)))
goto out;
goto restart;
}
/*
* Split as many Btree elements as required.
* This code tracks the new and old attr's location
* in the index/blkno/rmtblkno/rmtblkcnt fields and
* in the index2/blkno2/rmtblkno2/rmtblkcnt2 fields.
*/
XFS_BMAP_INIT(args->flist, args->firstblock);
error = xfs_da_split(state);
if (!error) {
error = xfs_bmap_finish(&args->trans, args->flist,
*args->firstblock, &committed);
}
if (error) {
ASSERT(committed);
args->trans = NULL;
xfs_bmap_cancel(args->flist);
goto out;
}
/*
* bmap_finish() may have committed the last trans and started
* a new one. We need the inode to be in all transactions.
*/
if (committed) {
xfs_trans_ijoin(args->trans, dp, XFS_ILOCK_EXCL);
xfs_trans_ihold(args->trans, dp);
}
} else {
/*
* Addition succeeded, update Btree hashvals.
*/
xfs_da_fixhashpath(state, &state->path);
}
/*
* Kill the state structure, we're done with it and need to
* allow the buffers to come back later.
*/
xfs_da_state_free(state);
state = NULL;
/*
* Commit the leaf addition or btree split and start the next
* trans in the chain.
*/
if ((error = xfs_attr_rolltrans(&args->trans, dp)))
goto out;
/*
* If there was an out-of-line value, allocate the blocks we
* identified for its storage and copy the value. This is done
* after we create the attribute so that we don't overflow the
* maximum size of a transaction and/or hit a deadlock.
*/
if (args->rmtblkno > 0) {
error = xfs_attr_rmtval_set(args);
if (error)
return(error);
}
/*
* If this is an atomic rename operation, we must "flip" the
* incomplete flags on the "new" and "old" attribute/value pairs
* so that one disappears and one appears atomically. Then we
* must remove the "old" attribute/value pair.
*/
if (args->rename) {
/*
* In a separate transaction, set the incomplete flag on the
* "old" attr and clear the incomplete flag on the "new" attr.
*/
error = xfs_attr_leaf_flipflags(args);
if (error)
goto out;
/*
* Dismantle the "old" attribute/value pair by removing
* a "remote" value (if it exists).
*/
args->index = args->index2;
args->blkno = args->blkno2;
args->rmtblkno = args->rmtblkno2;
args->rmtblkcnt = args->rmtblkcnt2;
if (args->rmtblkno) {
error = xfs_attr_rmtval_remove(args);
if (error)
return(error);
}
/*
* Re-find the "old" attribute entry after any split ops.
* The INCOMPLETE flag means that we will find the "old"
* attr, not the "new" one.
*/
args->flags |= XFS_ATTR_INCOMPLETE;
state = xfs_da_state_alloc();
state->args = args;
state->mp = mp;
state->blocksize = state->mp->m_sb.sb_blocksize;
state->node_ents = state->mp->m_attr_node_ents;
state->inleaf = 0;
error = xfs_da_node_lookup_int(state, &retval);
if (error)
goto out;
/*
* Remove the name and update the hashvals in the tree.
*/
blk = &state->path.blk[ state->path.active-1 ];
ASSERT(blk->magic == XFS_ATTR_LEAF_MAGIC);
error = xfs_attr_leaf_remove(blk->bp, args);
xfs_da_fixhashpath(state, &state->path);
/*
* Check to see if the tree needs to be collapsed.
*/
if (retval && (state->path.active > 1)) {
XFS_BMAP_INIT(args->flist, args->firstblock);
error = xfs_da_join(state);
if (!error) {
error = xfs_bmap_finish(&args->trans,
args->flist,
*args->firstblock,
&committed);
}
if (error) {
ASSERT(committed);
args->trans = NULL;
xfs_bmap_cancel(args->flist);
goto out;
}
/*
* bmap_finish() may have committed the last trans
* and started a new one. We need the inode to be
* in all transactions.
*/
if (committed) {
xfs_trans_ijoin(args->trans, dp, XFS_ILOCK_EXCL);
xfs_trans_ihold(args->trans, dp);
}
}
/*
* Commit and start the next trans in the chain.
*/
if ((error = xfs_attr_rolltrans(&args->trans, dp)))
goto out;
} else if (args->rmtblkno > 0) {
/*
* Added a "remote" value, just clear the incomplete flag.
*/
error = xfs_attr_leaf_clearflag(args);
if (error)
goto out;
}
retval = error = 0;
out:
if (state)
xfs_da_state_free(state);
if (error)
return(error);
return(retval);
}
/*
* Remove a name from a B-tree attribute list.
*
* This will involve walking down the Btree, and may involve joining
* leaf nodes and even joining intermediate nodes up to and including
* the root node (a special case of an intermediate node).
*/
STATIC int
xfs_attr_node_removename(xfs_da_args_t *args)
{
xfs_da_state_t *state;
xfs_da_state_blk_t *blk;
xfs_inode_t *dp;
xfs_dabuf_t *bp;
int retval, error, committed, forkoff;
/*
* Tie a string around our finger to remind us where we are.
*/
dp = args->dp;
state = xfs_da_state_alloc();
state->args = args;
state->mp = dp->i_mount;
state->blocksize = state->mp->m_sb.sb_blocksize;
state->node_ents = state->mp->m_attr_node_ents;
/*
* Search to see if name exists, and get back a pointer to it.
*/
error = xfs_da_node_lookup_int(state, &retval);
if (error || (retval != EEXIST)) {
if (error == 0)
error = retval;
goto out;
}
/*
* If there is an out-of-line value, de-allocate the blocks.
* This is done before we remove the attribute so that we don't
* overflow the maximum size of a transaction and/or hit a deadlock.
*/
blk = &state->path.blk[ state->path.active-1 ];
ASSERT(blk->bp != NULL);
ASSERT(blk->magic == XFS_ATTR_LEAF_MAGIC);
if (args->rmtblkno > 0) {
/*
* Fill in disk block numbers in the state structure
* so that we can get the buffers back after we commit
* several transactions in the following calls.
*/
error = xfs_attr_fillstate(state);
if (error)
goto out;
/*
* Mark the attribute as INCOMPLETE, then bunmapi() the
* remote value.
*/
error = xfs_attr_leaf_setflag(args);
if (error)
goto out;
error = xfs_attr_rmtval_remove(args);
if (error)
goto out;
/*
* Refill the state structure with buffers, the prior calls
* released our buffers.
*/
error = xfs_attr_refillstate(state);
if (error)
goto out;
}
/*
* Remove the name and update the hashvals in the tree.
*/
blk = &state->path.blk[ state->path.active-1 ];
ASSERT(blk->magic == XFS_ATTR_LEAF_MAGIC);
retval = xfs_attr_leaf_remove(blk->bp, args);
xfs_da_fixhashpath(state, &state->path);
/*
* Check to see if the tree needs to be collapsed.
*/
if (retval && (state->path.active > 1)) {
XFS_BMAP_INIT(args->flist, args->firstblock);
error = xfs_da_join(state);
if (!error) {
error = xfs_bmap_finish(&args->trans, args->flist,
*args->firstblock, &committed);
}
if (error) {
ASSERT(committed);
args->trans = NULL;
xfs_bmap_cancel(args->flist);
goto out;
}
/*
* bmap_finish() may have committed the last trans and started
* a new one. We need the inode to be in all transactions.
*/
if (committed) {
xfs_trans_ijoin(args->trans, dp, XFS_ILOCK_EXCL);
xfs_trans_ihold(args->trans, dp);
}
/*
* Commit the Btree join operation and start a new trans.
*/
if ((error = xfs_attr_rolltrans(&args->trans, dp)))
goto out;
}
/*
* If the result is small enough, push it all into the inode.
*/
if (xfs_bmap_one_block(dp, XFS_ATTR_FORK)) {
/*
* Have to get rid of the copy of this dabuf in the state.
*/
ASSERT(state->path.active == 1);
ASSERT(state->path.blk[0].bp);
xfs_da_buf_done(state->path.blk[0].bp);
state->path.blk[0].bp = NULL;
error = xfs_da_read_buf(args->trans, args->dp, 0, -1, &bp,
XFS_ATTR_FORK);
if (error)
goto out;
ASSERT(INT_GET(((xfs_attr_leafblock_t *)
bp->data)->hdr.info.magic, ARCH_CONVERT)
== XFS_ATTR_LEAF_MAGIC);
if ((forkoff = xfs_attr_shortform_allfit(bp, dp))) {
XFS_BMAP_INIT(args->flist, args->firstblock);
error = xfs_attr_leaf_to_shortform(bp, args, forkoff);
/* bp is gone due to xfs_da_shrink_inode */
if (!error) {
error = xfs_bmap_finish(&args->trans,
args->flist,
*args->firstblock,
&committed);
}
if (error) {
ASSERT(committed);
args->trans = NULL;
xfs_bmap_cancel(args->flist);
goto out;
}
/*
* bmap_finish() may have committed the last trans
* and started a new one. We need the inode to be
* in all transactions.
*/
if (committed) {
xfs_trans_ijoin(args->trans, dp, XFS_ILOCK_EXCL);
xfs_trans_ihold(args->trans, dp);
}
} else
xfs_da_brelse(args->trans, bp);
}
error = 0;
out:
xfs_da_state_free(state);
return(error);
}
/*
* Fill in the disk block numbers in the state structure for the buffers
* that are attached to the state structure.
* This is done so that we can quickly reattach ourselves to those buffers
* after some set of transaction commit's has released these buffers.
*/
STATIC int
xfs_attr_fillstate(xfs_da_state_t *state)
{
xfs_da_state_path_t *path;
xfs_da_state_blk_t *blk;
int level;
/*
* Roll down the "path" in the state structure, storing the on-disk
* block number for those buffers in the "path".
*/
path = &state->path;
ASSERT((path->active >= 0) && (path->active < XFS_DA_NODE_MAXDEPTH));
for (blk = path->blk, level = 0; level < path->active; blk++, level++) {
if (blk->bp) {
blk->disk_blkno = xfs_da_blkno(blk->bp);
xfs_da_buf_done(blk->bp);
blk->bp = NULL;
} else {
blk->disk_blkno = 0;
}
}
/*
* Roll down the "altpath" in the state structure, storing the on-disk
* block number for those buffers in the "altpath".
*/
path = &state->altpath;
ASSERT((path->active >= 0) && (path->active < XFS_DA_NODE_MAXDEPTH));
for (blk = path->blk, level = 0; level < path->active; blk++, level++) {
if (blk->bp) {
blk->disk_blkno = xfs_da_blkno(blk->bp);
xfs_da_buf_done(blk->bp);
blk->bp = NULL;
} else {
blk->disk_blkno = 0;
}
}
return(0);
}
/*
* Reattach the buffers to the state structure based on the disk block
* numbers stored in the state structure.
* This is done after some set of transaction commit's has released those
* buffers from our grip.
*/
STATIC int
xfs_attr_refillstate(xfs_da_state_t *state)
{
xfs_da_state_path_t *path;
xfs_da_state_blk_t *blk;
int level, error;
/*
* Roll down the "path" in the state structure, storing the on-disk
* block number for those buffers in the "path".
*/
path = &state->path;
ASSERT((path->active >= 0) && (path->active < XFS_DA_NODE_MAXDEPTH));
for (blk = path->blk, level = 0; level < path->active; blk++, level++) {
if (blk->disk_blkno) {
error = xfs_da_read_buf(state->args->trans,
state->args->dp,
blk->blkno, blk->disk_blkno,
&blk->bp, XFS_ATTR_FORK);
if (error)
return(error);
} else {
blk->bp = NULL;
}
}
/*
* Roll down the "altpath" in the state structure, storing the on-disk
* block number for those buffers in the "altpath".
*/
path = &state->altpath;
ASSERT((path->active >= 0) && (path->active < XFS_DA_NODE_MAXDEPTH));
for (blk = path->blk, level = 0; level < path->active; blk++, level++) {
if (blk->disk_blkno) {
error = xfs_da_read_buf(state->args->trans,
state->args->dp,
blk->blkno, blk->disk_blkno,
&blk->bp, XFS_ATTR_FORK);
if (error)
return(error);
} else {
blk->bp = NULL;
}
}
return(0);
}
/*
* Look up a filename in a node attribute list.
*
* This routine gets called for any attribute fork that has more than one
* block, ie: both true Btree attr lists and for single-leaf-blocks with
* "remote" values taking up more blocks.
*/
STATIC int
xfs_attr_node_get(xfs_da_args_t *args)
{
xfs_da_state_t *state;
xfs_da_state_blk_t *blk;
int error, retval;
int i;
state = xfs_da_state_alloc();
state->args = args;
state->mp = args->dp->i_mount;
state->blocksize = state->mp->m_sb.sb_blocksize;
state->node_ents = state->mp->m_attr_node_ents;
/*
* Search to see if name exists, and get back a pointer to it.
*/
error = xfs_da_node_lookup_int(state, &retval);
if (error) {
retval = error;
} else if (retval == EEXIST) {
blk = &state->path.blk[ state->path.active-1 ];
ASSERT(blk->bp != NULL);
ASSERT(blk->magic == XFS_ATTR_LEAF_MAGIC);
/*
* Get the value, local or "remote"
*/
retval = xfs_attr_leaf_getvalue(blk->bp, args);
if (!retval && (args->rmtblkno > 0)
&& !(args->flags & ATTR_KERNOVAL)) {
retval = xfs_attr_rmtval_get(args);
}
}
/*
* If not in a transaction, we have to release all the buffers.
*/
for (i = 0; i < state->path.active; i++) {
xfs_da_brelse(args->trans, state->path.blk[i].bp);
state->path.blk[i].bp = NULL;
}
xfs_da_state_free(state);
return(retval);
}
STATIC int /* error */
xfs_attr_node_list(xfs_attr_list_context_t *context)
{
attrlist_cursor_kern_t *cursor;
xfs_attr_leafblock_t *leaf;
xfs_da_intnode_t *node;
xfs_da_node_entry_t *btree;
int error, i;
xfs_dabuf_t *bp;
cursor = context->cursor;
cursor->initted = 1;
/*
* Do all sorts of validation on the passed-in cursor structure.
* If anything is amiss, ignore the cursor and look up the hashval
* starting from the btree root.
*/
bp = NULL;
if (cursor->blkno > 0) {
error = xfs_da_read_buf(NULL, context->dp, cursor->blkno, -1,
&bp, XFS_ATTR_FORK);
if ((error != 0) && (error != EFSCORRUPTED))
return(error);
if (bp) {
node = bp->data;
switch (INT_GET(node->hdr.info.magic, ARCH_CONVERT)) {
case XFS_DA_NODE_MAGIC:
xfs_attr_trace_l_cn("wrong blk", context, node);
xfs_da_brelse(NULL, bp);
bp = NULL;
break;
case XFS_ATTR_LEAF_MAGIC:
leaf = bp->data;
if (cursor->hashval >
INT_GET(leaf->entries[
INT_GET(leaf->hdr.count,
ARCH_CONVERT)-1].hashval,
ARCH_CONVERT)) {
xfs_attr_trace_l_cl("wrong blk",
context, leaf);
xfs_da_brelse(NULL, bp);
bp = NULL;
} else if (cursor->hashval <=
INT_GET(leaf->entries[0].hashval,
ARCH_CONVERT)) {
xfs_attr_trace_l_cl("maybe wrong blk",
context, leaf);
xfs_da_brelse(NULL, bp);
bp = NULL;
}
break;
default:
xfs_attr_trace_l_c("wrong blk - ??", context);
xfs_da_brelse(NULL, bp);
bp = NULL;
}
}
}
/*
* We did not find what we expected given the cursor's contents,
* so we start from the top and work down based on the hash value.
* Note that start of node block is same as start of leaf block.
*/
if (bp == NULL) {
cursor->blkno = 0;
for (;;) {
error = xfs_da_read_buf(NULL, context->dp,
cursor->blkno, -1, &bp,
XFS_ATTR_FORK);
if (error)
return(error);
if (unlikely(bp == NULL)) {
XFS_ERROR_REPORT("xfs_attr_node_list(2)",
XFS_ERRLEVEL_LOW,
context->dp->i_mount);
return(XFS_ERROR(EFSCORRUPTED));
}
node = bp->data;
if (INT_GET(node->hdr.info.magic, ARCH_CONVERT)
== XFS_ATTR_LEAF_MAGIC)
break;
if (unlikely(INT_GET(node->hdr.info.magic, ARCH_CONVERT)
!= XFS_DA_NODE_MAGIC)) {
XFS_CORRUPTION_ERROR("xfs_attr_node_list(3)",
XFS_ERRLEVEL_LOW,
context->dp->i_mount,
node);
xfs_da_brelse(NULL, bp);
return(XFS_ERROR(EFSCORRUPTED));
}
btree = node->btree;
for (i = 0;
i < INT_GET(node->hdr.count, ARCH_CONVERT);
btree++, i++) {
if (cursor->hashval
<= INT_GET(btree->hashval,
ARCH_CONVERT)) {
cursor->blkno = INT_GET(btree->before, ARCH_CONVERT);
xfs_attr_trace_l_cb("descending",
context, btree);
break;
}
}
if (i == INT_GET(node->hdr.count, ARCH_CONVERT)) {
xfs_da_brelse(NULL, bp);
return(0);
}
xfs_da_brelse(NULL, bp);
}
}
ASSERT(bp != NULL);
/*
* Roll upward through the blocks, processing each leaf block in
* order. As long as there is space in the result buffer, keep
* adding the information.
*/
for (;;) {
leaf = bp->data;
if (unlikely(INT_GET(leaf->hdr.info.magic, ARCH_CONVERT)
!= XFS_ATTR_LEAF_MAGIC)) {
XFS_CORRUPTION_ERROR("xfs_attr_node_list(4)",
XFS_ERRLEVEL_LOW,
context->dp->i_mount, leaf);
xfs_da_brelse(NULL, bp);
return(XFS_ERROR(EFSCORRUPTED));
}
error = xfs_attr_leaf_list_int(bp, context);
if (error || !leaf->hdr.info.forw)
break; /* not really an error, buffer full or EOF */
cursor->blkno = INT_GET(leaf->hdr.info.forw, ARCH_CONVERT);
xfs_da_brelse(NULL, bp);
error = xfs_da_read_buf(NULL, context->dp, cursor->blkno, -1,
&bp, XFS_ATTR_FORK);
if (error)
return(error);
if (unlikely((bp == NULL))) {
XFS_ERROR_REPORT("xfs_attr_node_list(5)",
XFS_ERRLEVEL_LOW,
context->dp->i_mount);
return(XFS_ERROR(EFSCORRUPTED));
}
}
xfs_da_brelse(NULL, bp);
return(0);
}
/*========================================================================
* External routines for manipulating out-of-line attribute values.
*========================================================================*/
/*
* Read the value associated with an attribute from the out-of-line buffer
* that we stored it in.
*/
STATIC int
xfs_attr_rmtval_get(xfs_da_args_t *args)
{
xfs_bmbt_irec_t map[ATTR_RMTVALUE_MAPSIZE];
xfs_mount_t *mp;
xfs_daddr_t dblkno;
xfs_caddr_t dst;
xfs_buf_t *bp;
int nmap, error, tmp, valuelen, blkcnt, i;
xfs_dablk_t lblkno;
ASSERT(!(args->flags & ATTR_KERNOVAL));
mp = args->dp->i_mount;
dst = args->value;
valuelen = args->valuelen;
lblkno = args->rmtblkno;
while (valuelen > 0) {
nmap = ATTR_RMTVALUE_MAPSIZE;
error = xfs_bmapi(args->trans, args->dp, (xfs_fileoff_t)lblkno,
args->rmtblkcnt,
XFS_BMAPI_ATTRFORK | XFS_BMAPI_METADATA,
NULL, 0, map, &nmap, NULL);
if (error)
return(error);
ASSERT(nmap >= 1);
for (i = 0; (i < nmap) && (valuelen > 0); i++) {
ASSERT((map[i].br_startblock != DELAYSTARTBLOCK) &&
(map[i].br_startblock != HOLESTARTBLOCK));
dblkno = XFS_FSB_TO_DADDR(mp, map[i].br_startblock);
blkcnt = XFS_FSB_TO_BB(mp, map[i].br_blockcount);
error = xfs_read_buf(mp, mp->m_ddev_targp, dblkno,
blkcnt, XFS_BUF_LOCK, &bp);
if (error)
return(error);
tmp = (valuelen < XFS_BUF_SIZE(bp))
? valuelen : XFS_BUF_SIZE(bp);
xfs_biomove(bp, 0, tmp, dst, XFS_B_READ);
xfs_buf_relse(bp);
dst += tmp;
valuelen -= tmp;
lblkno += map[i].br_blockcount;
}
}
ASSERT(valuelen == 0);
return(0);
}
/*
* Write the value associated with an attribute into the out-of-line buffer
* that we have defined for it.
*/
STATIC int
xfs_attr_rmtval_set(xfs_da_args_t *args)
{
xfs_mount_t *mp;
xfs_fileoff_t lfileoff;
xfs_inode_t *dp;
xfs_bmbt_irec_t map;
xfs_daddr_t dblkno;
xfs_caddr_t src;
xfs_buf_t *bp;
xfs_dablk_t lblkno;
int blkcnt, valuelen, nmap, error, tmp, committed;
dp = args->dp;
mp = dp->i_mount;
src = args->value;
/*
* Find a "hole" in the attribute address space large enough for
* us to drop the new attribute's value into.
*/
blkcnt = XFS_B_TO_FSB(mp, args->valuelen);
lfileoff = 0;
error = xfs_bmap_first_unused(args->trans, args->dp, blkcnt, &lfileoff,
XFS_ATTR_FORK);
if (error) {
return(error);
}
args->rmtblkno = lblkno = (xfs_dablk_t)lfileoff;
args->rmtblkcnt = blkcnt;
/*
* Roll through the "value", allocating blocks on disk as required.
*/
while (blkcnt > 0) {
/*
* Allocate a single extent, up to the size of the value.
*/
XFS_BMAP_INIT(args->flist, args->firstblock);
nmap = 1;
error = xfs_bmapi(args->trans, dp, (xfs_fileoff_t)lblkno,
blkcnt,
XFS_BMAPI_ATTRFORK | XFS_BMAPI_METADATA |
XFS_BMAPI_WRITE,
args->firstblock, args->total, &map, &nmap,
args->flist);
if (!error) {
error = xfs_bmap_finish(&args->trans, args->flist,
*args->firstblock, &committed);
}
if (error) {
ASSERT(committed);
args->trans = NULL;
xfs_bmap_cancel(args->flist);
return(error);
}
/*
* bmap_finish() may have committed the last trans and started
* a new one. We need the inode to be in all transactions.
*/
if (committed) {
xfs_trans_ijoin(args->trans, dp, XFS_ILOCK_EXCL);
xfs_trans_ihold(args->trans, dp);
}
ASSERT(nmap == 1);
ASSERT((map.br_startblock != DELAYSTARTBLOCK) &&
(map.br_startblock != HOLESTARTBLOCK));
lblkno += map.br_blockcount;
blkcnt -= map.br_blockcount;
/*
* Start the next trans in the chain.
*/
if ((error = xfs_attr_rolltrans(&args->trans, dp)))
return (error);
}
/*
* Roll through the "value", copying the attribute value to the
* already-allocated blocks. Blocks are written synchronously
* so that we can know they are all on disk before we turn off
* the INCOMPLETE flag.
*/
lblkno = args->rmtblkno;
valuelen = args->valuelen;
while (valuelen > 0) {
/*
* Try to remember where we decided to put the value.
*/
XFS_BMAP_INIT(args->flist, args->firstblock);
nmap = 1;
error = xfs_bmapi(NULL, dp, (xfs_fileoff_t)lblkno,
args->rmtblkcnt,
XFS_BMAPI_ATTRFORK | XFS_BMAPI_METADATA,
args->firstblock, 0, &map, &nmap, NULL);
if (error) {
return(error);
}
ASSERT(nmap == 1);
ASSERT((map.br_startblock != DELAYSTARTBLOCK) &&
(map.br_startblock != HOLESTARTBLOCK));
dblkno = XFS_FSB_TO_DADDR(mp, map.br_startblock),
blkcnt = XFS_FSB_TO_BB(mp, map.br_blockcount);
bp = xfs_buf_get_flags(mp->m_ddev_targp, dblkno,
blkcnt, XFS_BUF_LOCK);
ASSERT(bp);
ASSERT(!XFS_BUF_GETERROR(bp));
tmp = (valuelen < XFS_BUF_SIZE(bp)) ? valuelen :
XFS_BUF_SIZE(bp);
xfs_biomove(bp, 0, tmp, src, XFS_B_WRITE);
if (tmp < XFS_BUF_SIZE(bp))
xfs_biozero(bp, tmp, XFS_BUF_SIZE(bp) - tmp);
if ((error = xfs_bwrite(mp, bp))) {/* GROT: NOTE: synchronous write */
return (error);
}
src += tmp;
valuelen -= tmp;
lblkno += map.br_blockcount;
}
ASSERT(valuelen == 0);
return(0);
}
/*
* Remove the value associated with an attribute by deleting the
* out-of-line buffer that it is stored on.
*/
STATIC int
xfs_attr_rmtval_remove(xfs_da_args_t *args)
{
xfs_mount_t *mp;
xfs_bmbt_irec_t map;
xfs_buf_t *bp;
xfs_daddr_t dblkno;
xfs_dablk_t lblkno;
int valuelen, blkcnt, nmap, error, done, committed;
mp = args->dp->i_mount;
/*
* Roll through the "value", invalidating the attribute value's
* blocks.
*/
lblkno = args->rmtblkno;
valuelen = args->rmtblkcnt;
while (valuelen > 0) {
/*
* Try to remember where we decided to put the value.
*/
XFS_BMAP_INIT(args->flist, args->firstblock);
nmap = 1;
error = xfs_bmapi(NULL, args->dp, (xfs_fileoff_t)lblkno,
args->rmtblkcnt,
XFS_BMAPI_ATTRFORK | XFS_BMAPI_METADATA,
args->firstblock, 0, &map, &nmap,
args->flist);
if (error) {
return(error);
}
ASSERT(nmap == 1);
ASSERT((map.br_startblock != DELAYSTARTBLOCK) &&
(map.br_startblock != HOLESTARTBLOCK));
dblkno = XFS_FSB_TO_DADDR(mp, map.br_startblock),
blkcnt = XFS_FSB_TO_BB(mp, map.br_blockcount);
/*
* If the "remote" value is in the cache, remove it.
*/
bp = xfs_incore(mp->m_ddev_targp, dblkno, blkcnt,
XFS_INCORE_TRYLOCK);
if (bp) {
XFS_BUF_STALE(bp);
XFS_BUF_UNDELAYWRITE(bp);
xfs_buf_relse(bp);
bp = NULL;
}
valuelen -= map.br_blockcount;
lblkno += map.br_blockcount;
}
/*
* Keep de-allocating extents until the remote-value region is gone.
*/
lblkno = args->rmtblkno;
blkcnt = args->rmtblkcnt;
done = 0;
while (!done) {
XFS_BMAP_INIT(args->flist, args->firstblock);
error = xfs_bunmapi(args->trans, args->dp, lblkno, blkcnt,
XFS_BMAPI_ATTRFORK | XFS_BMAPI_METADATA,
1, args->firstblock, args->flist, &done);
if (!error) {
error = xfs_bmap_finish(&args->trans, args->flist,
*args->firstblock, &committed);
}
if (error) {
ASSERT(committed);
args->trans = NULL;
xfs_bmap_cancel(args->flist);
return(error);
}
/*
* bmap_finish() may have committed the last trans and started
* a new one. We need the inode to be in all transactions.
*/
if (committed) {
xfs_trans_ijoin(args->trans, args->dp, XFS_ILOCK_EXCL);
xfs_trans_ihold(args->trans, args->dp);
}
/*
* Close out trans and start the next one in the chain.
*/
if ((error = xfs_attr_rolltrans(&args->trans, args->dp)))
return (error);
}
return(0);
}
#if defined(XFS_ATTR_TRACE)
/*
* Add a trace buffer entry for an attr_list context structure.
*/
void
xfs_attr_trace_l_c(char *where, struct xfs_attr_list_context *context)
{
xfs_attr_trace_enter(XFS_ATTR_KTRACE_L_C, where,
(__psunsigned_t)context->dp,
(__psunsigned_t)context->cursor->hashval,
(__psunsigned_t)context->cursor->blkno,
(__psunsigned_t)context->cursor->offset,
(__psunsigned_t)context->alist,
(__psunsigned_t)context->bufsize,
(__psunsigned_t)context->count,
(__psunsigned_t)context->firstu,
(__psunsigned_t)
((context->count > 0) &&
!(context->flags & (ATTR_KERNAMELS|ATTR_KERNOVAL)))
? (ATTR_ENTRY(context->alist,
context->count-1)->a_valuelen)
: 0,
(__psunsigned_t)context->dupcnt,
(__psunsigned_t)context->flags,
(__psunsigned_t)NULL,
(__psunsigned_t)NULL,
(__psunsigned_t)NULL);
}
/*
* Add a trace buffer entry for a context structure and a Btree node.
*/
void
xfs_attr_trace_l_cn(char *where, struct xfs_attr_list_context *context,
struct xfs_da_intnode *node)
{
xfs_attr_trace_enter(XFS_ATTR_KTRACE_L_CN, where,
(__psunsigned_t)context->dp,
(__psunsigned_t)context->cursor->hashval,
(__psunsigned_t)context->cursor->blkno,
(__psunsigned_t)context->cursor->offset,
(__psunsigned_t)context->alist,
(__psunsigned_t)context->bufsize,
(__psunsigned_t)context->count,
(__psunsigned_t)context->firstu,
(__psunsigned_t)
((context->count > 0) &&
!(context->flags & (ATTR_KERNAMELS|ATTR_KERNOVAL)))
? (ATTR_ENTRY(context->alist,
context->count-1)->a_valuelen)
: 0,
(__psunsigned_t)context->dupcnt,
(__psunsigned_t)context->flags,
(__psunsigned_t)INT_GET(node->hdr.count, ARCH_CONVERT),
(__psunsigned_t)INT_GET(node->btree[0].hashval, ARCH_CONVERT),
(__psunsigned_t)INT_GET(node->btree[INT_GET(node->hdr.count, ARCH_CONVERT)-1].hashval, ARCH_CONVERT));
}
/*
* Add a trace buffer entry for a context structure and a Btree element.
*/
void
xfs_attr_trace_l_cb(char *where, struct xfs_attr_list_context *context,
struct xfs_da_node_entry *btree)
{
xfs_attr_trace_enter(XFS_ATTR_KTRACE_L_CB, where,
(__psunsigned_t)context->dp,
(__psunsigned_t)context->cursor->hashval,
(__psunsigned_t)context->cursor->blkno,
(__psunsigned_t)context->cursor->offset,
(__psunsigned_t)context->alist,
(__psunsigned_t)context->bufsize,
(__psunsigned_t)context->count,
(__psunsigned_t)context->firstu,
(__psunsigned_t)
((context->count > 0) &&
!(context->flags & (ATTR_KERNAMELS|ATTR_KERNOVAL)))
? (ATTR_ENTRY(context->alist,
context->count-1)->a_valuelen)
: 0,
(__psunsigned_t)context->dupcnt,
(__psunsigned_t)context->flags,
(__psunsigned_t)INT_GET(btree->hashval, ARCH_CONVERT),
(__psunsigned_t)INT_GET(btree->before, ARCH_CONVERT),
(__psunsigned_t)NULL);
}
/*
* Add a trace buffer entry for a context structure and a leaf block.
*/
void
xfs_attr_trace_l_cl(char *where, struct xfs_attr_list_context *context,
struct xfs_attr_leafblock *leaf)
{
xfs_attr_trace_enter(XFS_ATTR_KTRACE_L_CL, where,
(__psunsigned_t)context->dp,
(__psunsigned_t)context->cursor->hashval,
(__psunsigned_t)context->cursor->blkno,
(__psunsigned_t)context->cursor->offset,
(__psunsigned_t)context->alist,
(__psunsigned_t)context->bufsize,
(__psunsigned_t)context->count,
(__psunsigned_t)context->firstu,
(__psunsigned_t)
((context->count > 0) &&
!(context->flags & (ATTR_KERNAMELS|ATTR_KERNOVAL)))
? (ATTR_ENTRY(context->alist,
context->count-1)->a_valuelen)
: 0,
(__psunsigned_t)context->dupcnt,
(__psunsigned_t)context->flags,
(__psunsigned_t)INT_GET(leaf->hdr.count, ARCH_CONVERT),
(__psunsigned_t)INT_GET(leaf->entries[0].hashval, ARCH_CONVERT),
(__psunsigned_t)INT_GET(leaf->entries[INT_GET(leaf->hdr.count, ARCH_CONVERT)-1].hashval, ARCH_CONVERT));
}
/*
* Add a trace buffer entry for the arguments given to the routine,
* generic form.
*/
void
xfs_attr_trace_enter(int type, char *where,
__psunsigned_t a2, __psunsigned_t a3,
__psunsigned_t a4, __psunsigned_t a5,
__psunsigned_t a6, __psunsigned_t a7,
__psunsigned_t a8, __psunsigned_t a9,
__psunsigned_t a10, __psunsigned_t a11,
__psunsigned_t a12, __psunsigned_t a13,
__psunsigned_t a14, __psunsigned_t a15)
{
ASSERT(xfs_attr_trace_buf);
ktrace_enter(xfs_attr_trace_buf, (void *)((__psunsigned_t)type),
(void *)where,
(void *)a2, (void *)a3, (void *)a4,
(void *)a5, (void *)a6, (void *)a7,
(void *)a8, (void *)a9, (void *)a10,
(void *)a11, (void *)a12, (void *)a13,
(void *)a14, (void *)a15);
}
#endif /* XFS_ATTR_TRACE */
/*========================================================================
* System (pseudo) namespace attribute interface routines.
*========================================================================*/
STATIC int
posix_acl_access_set(
vnode_t *vp, char *name, void *data, size_t size, int xflags)
{
return xfs_acl_vset(vp, data, size, _ACL_TYPE_ACCESS);
}
STATIC int
posix_acl_access_remove(
struct vnode *vp, char *name, int xflags)
{
return xfs_acl_vremove(vp, _ACL_TYPE_ACCESS);
}
STATIC int
posix_acl_access_get(
vnode_t *vp, char *name, void *data, size_t size, int xflags)
{
return xfs_acl_vget(vp, data, size, _ACL_TYPE_ACCESS);
}
STATIC int
posix_acl_access_exists(
vnode_t *vp)
{
return xfs_acl_vhasacl_access(vp);
}
STATIC int
posix_acl_default_set(
vnode_t *vp, char *name, void *data, size_t size, int xflags)
{
return xfs_acl_vset(vp, data, size, _ACL_TYPE_DEFAULT);
}
STATIC int
posix_acl_default_get(
vnode_t *vp, char *name, void *data, size_t size, int xflags)
{
return xfs_acl_vget(vp, data, size, _ACL_TYPE_DEFAULT);
}
STATIC int
posix_acl_default_remove(
struct vnode *vp, char *name, int xflags)
{
return xfs_acl_vremove(vp, _ACL_TYPE_DEFAULT);
}
STATIC int
posix_acl_default_exists(
vnode_t *vp)
{
return xfs_acl_vhasacl_default(vp);
}
STATIC struct attrnames posix_acl_access = {
.attr_name = "posix_acl_access",
.attr_namelen = sizeof("posix_acl_access") - 1,
.attr_get = posix_acl_access_get,
.attr_set = posix_acl_access_set,
.attr_remove = posix_acl_access_remove,
.attr_exists = posix_acl_access_exists,
};
STATIC struct attrnames posix_acl_default = {
.attr_name = "posix_acl_default",
.attr_namelen = sizeof("posix_acl_default") - 1,
.attr_get = posix_acl_default_get,
.attr_set = posix_acl_default_set,
.attr_remove = posix_acl_default_remove,
.attr_exists = posix_acl_default_exists,
};
STATIC struct attrnames *attr_system_names[] =
{ &posix_acl_access, &posix_acl_default };
/*========================================================================
* Namespace-prefix-style attribute name interface routines.
*========================================================================*/
STATIC int
attr_generic_set(
struct vnode *vp, char *name, void *data, size_t size, int xflags)
{
int error;
VOP_ATTR_SET(vp, name, data, size, xflags, NULL, error);
return -error;
}
STATIC int
attr_generic_get(
struct vnode *vp, char *name, void *data, size_t size, int xflags)
{
int error, asize = size;
VOP_ATTR_GET(vp, name, data, &asize, xflags, NULL, error);
if (!error)
return asize;
return -error;
}
STATIC int
attr_generic_remove(
struct vnode *vp, char *name, int xflags)
{
int error;
VOP_ATTR_REMOVE(vp, name, xflags, NULL, error);
return -error;
}
STATIC int
attr_generic_listadd(
attrnames_t *prefix,
attrnames_t *namesp,
void *data,
size_t size,
ssize_t *result)
{
char *p = data + *result;
*result += prefix->attr_namelen;
*result += namesp->attr_namelen + 1;
if (!size)
return 0;
if (*result > size)
return -ERANGE;
strcpy(p, prefix->attr_name);
p += prefix->attr_namelen;
strcpy(p, namesp->attr_name);
p += namesp->attr_namelen + 1;
return 0;
}
STATIC int
attr_system_list(
struct vnode *vp,
void *data,
size_t size,
ssize_t *result)
{
attrnames_t *namesp;
int i, error = 0;
for (i = 0; i < ATTR_SYSCOUNT; i++) {
namesp = attr_system_names[i];
if (!namesp->attr_exists || !namesp->attr_exists(vp))
continue;
error = attr_generic_listadd(&attr_system, namesp,
data, size, result);
if (error)
break;
}
return error;
}
int
attr_generic_list(
struct vnode *vp, void *data, size_t size, int xflags, ssize_t *result)
{
attrlist_cursor_kern_t cursor = { 0 };
int error;
VOP_ATTR_LIST(vp, data, size, xflags, &cursor, NULL, error);
if (error > 0)
return -error;
*result = -error;
return attr_system_list(vp, data, size, result);
}
attrnames_t *
attr_lookup_namespace(
char *name,
struct attrnames **names,
int nnames)
{
int i;
for (i = 0; i < nnames; i++)
if (!strncmp(name, names[i]->attr_name, names[i]->attr_namelen))
return names[i];
return NULL;
}
/*
* Some checks to prevent people abusing EAs to get over quota:
* - Don't allow modifying user EAs on devices/symlinks;
* - Don't allow modifying user EAs if sticky bit set;
*/
STATIC int
attr_user_capable(
struct vnode *vp,
cred_t *cred)
{
struct inode *inode = LINVFS_GET_IP(vp);
if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
return -EPERM;
if (!S_ISREG(inode->i_mode) && !S_ISDIR(inode->i_mode) &&
!capable(CAP_SYS_ADMIN))
return -EPERM;
if (S_ISDIR(inode->i_mode) && (inode->i_mode & S_ISVTX) &&
(current_fsuid(cred) != inode->i_uid) && !capable(CAP_FOWNER))
return -EPERM;
return 0;
}
STATIC int
attr_trusted_capable(
struct vnode *vp,
cred_t *cred)
{
struct inode *inode = LINVFS_GET_IP(vp);
if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
return -EPERM;
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
return 0;
}
STATIC int
attr_secure_capable(
struct vnode *vp,
cred_t *cred)
{
return -ENOSECURITY;
}
STATIC int
attr_system_set(
struct vnode *vp, char *name, void *data, size_t size, int xflags)
{
attrnames_t *namesp;
int error;
if (xflags & ATTR_CREATE)
return -EINVAL;
namesp = attr_lookup_namespace(name, attr_system_names, ATTR_SYSCOUNT);
if (!namesp)
return -EOPNOTSUPP;
error = namesp->attr_set(vp, name, data, size, xflags);
if (!error)
error = vn_revalidate(vp);
return error;
}
STATIC int
attr_system_get(
struct vnode *vp, char *name, void *data, size_t size, int xflags)
{
attrnames_t *namesp;
namesp = attr_lookup_namespace(name, attr_system_names, ATTR_SYSCOUNT);
if (!namesp)
return -EOPNOTSUPP;
return namesp->attr_get(vp, name, data, size, xflags);
}
STATIC int
attr_system_remove(
struct vnode *vp, char *name, int xflags)
{
attrnames_t *namesp;
namesp = attr_lookup_namespace(name, attr_system_names, ATTR_SYSCOUNT);
if (!namesp)
return -EOPNOTSUPP;
return namesp->attr_remove(vp, name, xflags);
}
struct attrnames attr_system = {
.attr_name = "system.",
.attr_namelen = sizeof("system.") - 1,
.attr_flag = ATTR_SYSTEM,
.attr_get = attr_system_get,
.attr_set = attr_system_set,
.attr_remove = attr_system_remove,
.attr_capable = (attrcapable_t)fs_noerr,
};
struct attrnames attr_trusted = {
.attr_name = "trusted.",
.attr_namelen = sizeof("trusted.") - 1,
.attr_flag = ATTR_ROOT,
.attr_get = attr_generic_get,
.attr_set = attr_generic_set,
.attr_remove = attr_generic_remove,
.attr_capable = attr_trusted_capable,
};
struct attrnames attr_secure = {
.attr_name = "security.",
.attr_namelen = sizeof("security.") - 1,
.attr_flag = ATTR_SECURE,
.attr_get = attr_generic_get,
.attr_set = attr_generic_set,
.attr_remove = attr_generic_remove,
.attr_capable = attr_secure_capable,
};
struct attrnames attr_user = {
.attr_name = "user.",
.attr_namelen = sizeof("user.") - 1,
.attr_get = attr_generic_get,
.attr_set = attr_generic_set,
.attr_remove = attr_generic_remove,
.attr_capable = attr_user_capable,
};
struct attrnames *attr_namespaces[] =
{ &attr_system, &attr_trusted, &attr_secure, &attr_user };
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