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xfs_attr.c
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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_trans.h"
#include "xfs_sb.h"
#include "xfs_ag.h"
#include "xfs_mount.h"
#include "xfs_da_btree.h"
#include "xfs_bmap_btree.h"
#include "xfs_attr_sf.h"
#include "xfs_dinode.h"
#include "xfs_inode.h"
#include "xfs_alloc.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_vnodeops.h"
#include "xfs_trace.h"
/*
* xfs_attr.c
*
* Provide the external interfaces to manage attribute lists.
*/
/*========================================================================
* 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_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 */
STATIC int
xfs_attr_name_to_xname(
struct xfs_name *xname,
const unsigned char *aname)
{
if (!aname)
return EINVAL;
xname->name = aname;
xname->len = strlen((char *)aname);
if (xname->len >= MAXNAMELEN)
return EFAULT; /* match IRIX behaviour */
return 0;
}
STATIC int
xfs_inode_hasattr(
struct xfs_inode *ip)
{
if (!XFS_IFORK_Q(ip) ||
(ip->i_d.di_aformat == XFS_DINODE_FMT_EXTENTS &&
ip->i_d.di_anextents == 0))
return 0;
return 1;
}
/*========================================================================
* Overall external interface routines.
*========================================================================*/
STATIC int
xfs_attr_get_int(
struct xfs_inode *ip,
struct xfs_name *name,
unsigned char *value,
int *valuelenp,
int flags)
{
xfs_da_args_t args;
int error;
if (!xfs_inode_hasattr(ip))
return ENOATTR;
/*
* Fill in the arg structure for this request.
*/
memset((char *)&args, 0, sizeof(args));
args.name = name->name;
args.namelen = name->len;
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 (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(
xfs_inode_t *ip,
const unsigned char *name,
unsigned char *value,
int *valuelenp,
int flags)
{
int error;
struct xfs_name xname;
XFS_STATS_INC(xs_attr_get);
if (XFS_FORCED_SHUTDOWN(ip->i_mount))
return(EIO);
error = xfs_attr_name_to_xname(&xname, name);
if (error)
return error;
xfs_ilock(ip, XFS_ILOCK_SHARED);
error = xfs_attr_get_int(ip, &xname, value, valuelenp, flags);
xfs_iunlock(ip, XFS_ILOCK_SHARED);
return(error);
}
/*
* Calculate how many blocks we need for the new attribute,
*/
STATIC int
xfs_attr_calc_size(
struct xfs_inode *ip,
int namelen,
int valuelen,
int *local)
{
struct xfs_mount *mp = ip->i_mount;
int size;
int nblks;
/*
* 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);
nblks = XFS_DAENTER_SPACE_RES(mp, XFS_ATTR_FORK);
if (*local) {
if (size > (mp->m_sb.sb_blocksize >> 1)) {
/* Double split possible */
nblks *= 2;
}
} else {
/*
* Out of line attribute, cannot double split, but
* make room for the attribute value itself.
*/
uint dblocks = XFS_B_TO_FSB(mp, valuelen);
nblks += dblocks;
nblks += XFS_NEXTENTADD_SPACE_RES(mp, dblocks, XFS_ATTR_FORK);
}
return nblks;
}
STATIC int
xfs_attr_set_int(
struct xfs_inode *dp,
struct xfs_name *name,
unsigned char *value,
int valuelen,
int flags)
{
xfs_da_args_t args;
xfs_fsblock_t firstblock;
xfs_bmap_free_t flist;
int error, err2, committed;
xfs_mount_t *mp = dp->i_mount;
int rsvd = (flags & ATTR_ROOT) != 0;
int local;
/*
* Attach the dquots to the inode.
*/
error = xfs_qm_dqattach(dp, 0);
if (error)
return error;
/*
* 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) {
int sf_size = sizeof(xfs_attr_sf_hdr_t) +
XFS_ATTR_SF_ENTSIZE_BYNAME(name->len, valuelen);
if ((error = xfs_bmap_add_attrfork(dp, sf_size, rsvd)))
return(error);
}
/*
* Fill in the arg structure for this request.
*/
memset((char *)&args, 0, sizeof(args));
args.name = name->name;
args.namelen = name->len;
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.op_flags = XFS_DA_OP_ADDNAME | XFS_DA_OP_OKNOENT;
/* Size is now blocks for attribute data */
args.total = xfs_attr_calc_size(dp, name->len, valuelen, &local);
/*
* 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, args.total,
XFS_ATTRSET_LOG_RES(mp, args.total), 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(args.trans, dp, args.total, 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, 0);
/*
* If the attribute list is non-existent 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);
}
if (!error && (flags & ATTR_KERNOTIME) == 0) {
xfs_trans_ichgtime(args.trans, dp,
XFS_ICHGTIME_CHG);
}
err2 = xfs_trans_commit(args.trans,
XFS_TRANS_RELEASE_LOG_RES);
xfs_iunlock(dp, XFS_ILOCK_EXCL);
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,
&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, 0);
/*
* Commit the leaf transformation. We'll need another (linked)
* transaction to add the new attribute to the leaf.
*/
error = xfs_trans_roll(&args.trans, dp);
if (error)
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);
}
if ((flags & ATTR_KERNOTIME) == 0)
xfs_trans_ichgtime(args.trans, dp, XFS_ICHGTIME_CHG);
/*
* 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);
xfs_iunlock(dp, XFS_ILOCK_EXCL);
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(
xfs_inode_t *dp,
const unsigned char *name,
unsigned char *value,
int valuelen,
int flags)
{
int error;
struct xfs_name xname;
XFS_STATS_INC(xs_attr_set);
if (XFS_FORCED_SHUTDOWN(dp->i_mount))
return (EIO);
error = xfs_attr_name_to_xname(&xname, name);
if (error)
return error;
return xfs_attr_set_int(dp, &xname, 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, struct xfs_name *name, 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->name;
args.namelen = name->len;
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;
/*
* we have no control over the attribute names that userspace passes us
* to remove, so we have to allow the name lookup prior to attribute
* removal to fail.
*/
args.op_flags = XFS_DA_OP_OKNOENT;
/*
* Attach the dquots to the inode.
*/
error = xfs_qm_dqattach(dp, 0);
if (error)
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, 0);
/*
* Decide on what work routines to call based on the inode size.
*/
if (!xfs_inode_hasattr(dp)) {
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);
}
if ((flags & ATTR_KERNOTIME) == 0)
xfs_trans_ichgtime(args.trans, dp, XFS_ICHGTIME_CHG);
/*
* 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);
xfs_iunlock(dp, XFS_ILOCK_EXCL);
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(
xfs_inode_t *dp,
const unsigned char *name,
int flags)
{
int error;
struct xfs_name xname;
XFS_STATS_INC(xs_attr_remove);
if (XFS_FORCED_SHUTDOWN(dp->i_mount))
return (EIO);
error = xfs_attr_name_to_xname(&xname, name);
if (error)
return error;
xfs_ilock(dp, XFS_ILOCK_SHARED);
if (!xfs_inode_hasattr(dp)) {
xfs_iunlock(dp, XFS_ILOCK_SHARED);
return XFS_ERROR(ENOATTR);
}
xfs_iunlock(dp, XFS_ILOCK_SHARED);
return xfs_attr_remove_int(dp, &xname, flags);
}
int
xfs_attr_list_int(xfs_attr_list_context_t *context)
{
int error;
xfs_inode_t *dp = context->dp;
XFS_STATS_INC(xs_attr_list);
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.
*/
if (!xfs_inode_hasattr(dp)) {
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);
return error;
}
#define ATTR_ENTBASESIZE /* minimum bytes used by an attr */ \
(((struct attrlist_ent *) 0)->a_name - (char *) 0)
#define ATTR_ENTSIZE(namelen) /* actual bytes used by an attr */ \
((ATTR_ENTBASESIZE + (namelen) + 1 + sizeof(u_int32_t)-1) \
& ~(sizeof(u_int32_t)-1))
/*
* Format an attribute and copy it out to the user's buffer.
* Take care to check values and protect against them changing later,
* we may be reading them directly out of a user buffer.
*/
/*ARGSUSED*/
STATIC int
xfs_attr_put_listent(
xfs_attr_list_context_t *context,
int flags,
unsigned char *name,
int namelen,
int valuelen,
unsigned char *value)
{
struct attrlist *alist = (struct attrlist *)context->alist;
attrlist_ent_t *aep;
int arraytop;
ASSERT(!(context->flags & ATTR_KERNOVAL));
ASSERT(context->count >= 0);
ASSERT(context->count < (ATTR_MAX_VALUELEN/8));
ASSERT(context->firstu >= sizeof(*alist));
ASSERT(context->firstu <= context->bufsize);
/*
* Only list entries in the right namespace.
*/
if (((context->flags & ATTR_SECURE) == 0) !=
((flags & XFS_ATTR_SECURE) == 0))
return 0;
if (((context->flags & ATTR_ROOT) == 0) !=
((flags & XFS_ATTR_ROOT) == 0))
return 0;
arraytop = sizeof(*alist) +
context->count * sizeof(alist->al_offset[0]);
context->firstu -= ATTR_ENTSIZE(namelen);
if (context->firstu < arraytop) {
trace_xfs_attr_list_full(context);
alist->al_more = 1;
context->seen_enough = 1;
return 1;
}
aep = (attrlist_ent_t *)&context->alist[context->firstu];
aep->a_valuelen = valuelen;
memcpy(aep->a_name, name, namelen);
aep->a_name[namelen] = 0;
alist->al_offset[context->count++] = context->firstu;
alist->al_count = context->count;
trace_xfs_attr_list_add(context);
return 0;
}
/*
* 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(
xfs_inode_t *dp,
char *buffer,
int bufsize,
int flags,
attrlist_cursor_kern_t *cursor)
{
xfs_attr_list_context_t context;
struct attrlist *alist;
int error;
/*
* 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.
*/
memset(&context, 0, sizeof(context));
context.dp = dp;
context.cursor = cursor;
context.resynch = 1;
context.flags = flags;
context.alist = buffer;
context.bufsize = (bufsize & ~(sizeof(int)-1)); /* align */
context.firstu = context.bufsize;
context.put_listent = xfs_attr_put_listent;
alist = (struct attrlist *)context.alist;
alist->al_count = 0;
alist->al_more = 0;
alist->al_offset[0] = context.bufsize;
error = xfs_attr_list_int(&context);
ASSERT(error >= 0);
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_inode_hasattr(dp) ||
dp->i_d.di_aformat == XFS_DINODE_FMT_LOCAL) {
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, 0);
/*
* Decide on what work routines to call based on the inode size.
*/
if (!xfs_inode_hasattr(dp) ||
dp->i_d.di_aformat == XFS_DINODE_FMT_LOCAL) {
error = 0;
goto out;
}
error = xfs_attr_root_inactive(&trans, dp);
if (error)
goto out;
error = xfs_itruncate_extents(&trans, dp, XFS_ATTR_FORK, 0);
if (error)
goto out;
error = xfs_trans_commit(trans, XFS_TRANS_RELEASE_LOG_RES);
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;
trace_xfs_attr_sf_addname(args);
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).
*/
STATIC int
xfs_attr_leaf_addname(xfs_da_args_t *args)
{
xfs_inode_t *dp;
struct xfs_buf *bp;
int retval, error, committed, forkoff;
trace_xfs_attr_leaf_addname(args);
/*
* 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_trans_brelse(args->trans, bp);
return(retval);
} else if (retval == EEXIST) {
if (args->flags & ATTR_CREATE) { /* pure create op */
xfs_trans_brelse(args->trans, bp);
return(retval);
}
trace_xfs_attr_leaf_replace(args);
args->op_flags |= XFS_DA_OP_RENAME; /* 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);
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,
&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, 0);
/*
* Commit the current trans (including the inode) and start
* a new one.
*/
error = xfs_trans_roll(&args->trans, dp);
if (error)
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.
*/
error = xfs_trans_roll(&args->trans, dp);
if (error)
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);
}