File: [Development] / xfs-linux-nodel / xfs_attr.c (download)
Revision 1.27, Tue Oct 31 06:13:19 1995 UTC (21 years, 11 months ago) by ack
Branch: MAIN
Changes since 1.26: +639 -426
lines
auto-merge of changes from /proj/banyan/isms/irix/kern/fs/xfs/RCS/xfs_attr.c,v
> ----------------------------
> revision 1.28
> date: 1995/10/28 02:08:29; author: curtis; state: Exp; lines: +639 -426
> Major rework to fix fundamentally incorrect usage of the transaction code.
> =============================================================================
|
#include <sys/param.h>
#include <sys/errno.h>
#include <sys/buf.h>
#include <sys/cred.h>
#include <sys/kmem.h>
#include <sys/uio.h>
#include <sys/debug.h>
#include <sys/vnode.h>
#include <sys/dirent.h>
#include <sys/uuid.h>
#include <sys/grio.h>
#include <sys/ktrace.h>
#include <sys/sysinfo.h>
#include <sys/ksa.h>
#include <sys/systm.h>
#include <sys/attributes.h>
#include "xfs_macros.h"
#include "xfs_types.h"
#include "xfs_inum.h"
#include "xfs_log.h"
#include "xfs_trans.h"
#include "xfs_sb.h"
#include "xfs_ag.h"
#include "xfs_mount.h"
#include "xfs_alloc_btree.h"
#include "xfs_bmap_btree.h"
#include "xfs_ialloc_btree.h"
#include "xfs_alloc.h"
#include "xfs_bmap.h"
#include "xfs_btree.h"
#include "xfs_bmap.h"
#include "xfs_attr_sf.h"
#include "xfs_dir_sf.h"
#include "xfs_dinode.h"
#include "xfs_inode_item.h"
#include "xfs_inode.h"
#include "xfs_da_btree.h"
#include "xfs_attr.h"
#include "xfs_attr_leaf.h"
#include "xfs_error.h"
#include "xfs_bit.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_addname(xfs_da_args_t *args);
STATIC int xfs_attr_node_get(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 */
#define ATTR_RMTVALUE_TRANSBLKS 8 /* max # of blks in a transaction */
#if defined(DEBUG) && !defined(SIM)
ktrace_t *xfs_attr_trace_buf;
#endif
/*========================================================================
* Overall external interface routines.
*========================================================================*/
/*ARGSUSED*/
int /* error */
xfs_attr_get(vnode_t *vp, char *name, char *value, int *valuelenp, int flags,
struct cred *cred)
{
xfs_da_args_t args;
int error;
XFSSTATS.xs_attr_get++;
/*
* Fill in the arg structure for this request.
*/
bzero((char *)&args, sizeof(args));
args.name = name;
args.namelen = strlen(name);
args.value = value;
args.valuelen = *valuelenp;
args.flags = flags;
args.hashval = xfs_da_hashname(args.name, args.namelen);
args.dp = XFS_VTOI(vp);
args.whichfork = XFS_ATTR_FORK;
args.trans = NULL;
/*
* Do we answer them, or ignore them?
*/
xfs_ilock(args.dp, XFS_ILOCK_SHARED);
if (error = xfs_iaccess(XFS_VTOI(vp), IREAD, cred)) {
xfs_iunlock(args.dp, XFS_ILOCK_SHARED);
return(XFS_ERROR(error));
}
/*
* Decide on what work routines to call based on the inode size.
*/
if (XFS_IFORK_Q(args.dp) == 0) {
error = ENOATTR;
} else if (args.dp->i_d.di_aformat == XFS_DINODE_FMT_LOCAL) {
error = xfs_attr_shortform_getvalue(&args);
} else if (xfs_bmap_one_block(args.dp, XFS_ATTR_FORK)) {
error = xfs_attr_leaf_get(&args);
} else {
error = xfs_attr_node_get(&args);
}
xfs_iunlock(args.dp, XFS_ILOCK_SHARED);
/*
* Return the number of bytes in the value to the caller.
*/
*valuelenp = args.valuelen;
if (error == EEXIST)
error = 0;
return(error);
}
/*ARGSUSED*/
int /* error */
xfs_attr_set(vnode_t *vp, char *name, char *value, int valuelen, int flags,
struct cred *cred)
{
xfs_da_args_t args;
xfs_inode_t *dp;
xfs_fsblock_t firstblock;
xfs_bmap_free_t flist;
int error, committed;
XFSSTATS.xs_attr_set++;
/*
* Do we answer them, or ignore them?
*/
dp = XFS_VTOI(vp);
xfs_ilock(dp, XFS_ILOCK_SHARED);
if (error = xfs_iaccess(dp, IWRITE, cred)) {
xfs_iunlock(dp, XFS_ILOCK_SHARED);
return(XFS_ERROR(error));
}
xfs_iunlock(dp, XFS_ILOCK_SHARED);
/*
* 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) {
error = xfs_bmap_add_attrfork(dp);
if (error)
return(error);
}
/*
* Fill in the arg structure for this request.
*/
bzero((char *)&args, sizeof(args));
args.name = name;
args.namelen = strlen(name);
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.total = 10 + XFS_B_TO_FSB(dp->i_mount, valuelen);
args.whichfork = XFS_ATTR_FORK;
/*
* 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(dp->i_mount, XFS_TRANS_ATTR_SET);
if (error = xfs_trans_reserve(args.trans,
10 + XFS_B_TO_FSB(dp->i_mount, valuelen),
XFS_ATTRSET_LOG_RES(dp->i_mount),
0, XFS_TRANS_PERM_LOG_RES,
XFS_ATTRSET_LOG_COUNT)) {
xfs_trans_cancel(args.trans, XFS_TRANS_RELEASE_LOG_RES);
return(error);
}
xfs_ilock(dp, XFS_ILOCK_EXCL);
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_afp->if_bytes == 0) ||
(dp->i_d.di_aformat == XFS_DINODE_FMT_LOCAL)) {
/*
* Build initial attribute list (if required).
*/
if (dp->i_afp->if_bytes == 0)
(void)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 (dp->i_mount->m_flags & XFS_MOUNT_WSYNC) {
xfs_trans_set_sync(args.trans);
}
xfs_trans_commit(args.trans, XFS_TRANS_RELEASE_LOG_RES);
xfs_iunlock(dp, XFS_ILOCK_EXCL);
/*
* Hit the inode change time.
*/
if ((flags & ATTR_KERNOTIME) == 0) {
xfs_ichgtime(dp, XFS_ICHGTIME_CHG);
}
return(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) {
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.
*/
xfs_attr_rolltrans(&args.trans, dp);
}
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 (dp->i_mount->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);
xfs_trans_commit(args.trans, XFS_TRANS_RELEASE_LOG_RES);
xfs_iunlock(dp, XFS_ILOCK_EXCL);
/*
* Hit the inode change time.
*/
if ((flags & ATTR_KERNOTIME) == 0) {
xfs_ichgtime(dp, XFS_ICHGTIME_CHG);
}
return(0);
out:
xfs_trans_cancel(args.trans, XFS_TRANS_RELEASE_LOG_RES);
xfs_iunlock(dp, XFS_ILOCK_EXCL);
return(error);
}
/*
* Generic handler routine to remove a name from an attribute list.
* Transitions attribute list from Btree to shortform as necessary.
*/
/*ARGSUSED*/
int /* error */
xfs_attr_remove(vnode_t *vp, char *name, int flags, struct cred *cred)
{
xfs_da_args_t args;
xfs_inode_t *dp;
xfs_fsblock_t firstblock;
xfs_bmap_free_t flist;
int error;
XFSSTATS.xs_attr_remove++;
/*
* Do we answer them, or ignore them?
*/
dp = XFS_VTOI(vp);
xfs_ilock(dp, XFS_ILOCK_SHARED);
if (error = xfs_iaccess(dp, IWRITE, cred)) {
xfs_iunlock(dp, XFS_ILOCK_SHARED);
return(XFS_ERROR(error));
} else if (XFS_IFORK_Q(dp) == 0) {
xfs_iunlock(dp, XFS_ILOCK_SHARED);
return(XFS_ERROR(ENOATTR));
}
xfs_iunlock(dp, XFS_ILOCK_SHARED);
/*
* Fill in the arg structure for this request.
*/
bzero((char *)&args, sizeof(args));
args.name = name;
args.namelen = strlen(name);
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;
/*
* 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(dp->i_mount, XFS_TRANS_ATTR_RM);
if (error = xfs_trans_reserve(args.trans, 16,
XFS_ATTRRM_LOG_RES(dp->i_mount),
0, XFS_TRANS_PERM_LOG_RES,
XFS_ATTRRM_LOG_COUNT)) {
xfs_trans_cancel(args.trans, XFS_TRANS_RELEASE_LOG_RES);
return(error);
}
xfs_ilock(dp, XFS_ILOCK_EXCL);
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) {
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 (dp->i_mount->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);
xfs_trans_commit(args.trans, XFS_TRANS_RELEASE_LOG_RES);
xfs_iunlock(dp, XFS_ILOCK_EXCL);
/*
* Hit the inode change time.
*/
if ((flags & ATTR_KERNOTIME) == 0) {
xfs_ichgtime(dp, XFS_ICHGTIME_CHG);
}
return(0);
out:
xfs_trans_cancel(args.trans, XFS_TRANS_RELEASE_LOG_RES);
xfs_iunlock(dp, XFS_ILOCK_EXCL);
return(error);
}
/*ARGSUSED*/
int /* error */
xfs_attr_list(vnode_t *vp, 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;
XFSSTATS.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));
}
/*
* Initialize the output buffer.
*/
context.dp = dp = XFS_VTOI(vp);
context.cursor = cursor;
context.count = 0;
context.dupcnt = 0;
context.resynch = 1;
context.flags = flags;
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;
/*
* Do they have permission?
*/
xfs_ilock(dp, XFS_ILOCK_SHARED);
if (error = xfs_iaccess(dp, IREAD, cred)) {
xfs_iunlock(dp, XFS_ILOCK_SHARED);
return(XFS_ERROR(error));
}
/*
* 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) {
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);
return(error);
}
int /* error */
xfs_attr_inactive(xfs_inode_t *dp)
{
xfs_trans_t *trans;
int error;
xfs_ilock(dp, XFS_ILOCK_EXCL);
if ((XFS_IFORK_Q(dp) == 0) ||
(dp->i_d.di_aformat == XFS_DINODE_FMT_LOCAL)) {
xfs_iunlock(dp, XFS_ILOCK_EXCL);
return(0);
}
xfs_iunlock(dp, XFS_ILOCK_EXCL);
/*
* 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(dp->i_mount, XFS_TRANS_ATTRINVAL);
if (error = xfs_trans_reserve(trans, 16,
XFS_ATTRINVAL_LOG_RES(dp->i_mount),
0, XFS_TRANS_PERM_LOG_RES,
XFS_ATTRINVAL_LOG_COUNT)) {
xfs_trans_cancel(trans, XFS_TRANS_RELEASE_LOG_RES);
return(error);
}
xfs_ilock(dp, XFS_ILOCK_EXCL);
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)) {
error = 0;
goto out;
}
error = xfs_attr_root_inactive(&trans, dp);
if (error)
goto out;
/*
* Commit the last in the sequence of transactions.
*/
xfs_trans_log_inode(trans, dp, XFS_ILOG_CORE);
xfs_trans_commit(trans, XFS_TRANS_RELEASE_LOG_RES);
xfs_iunlock(dp, XFS_ILOCK_EXCL);
return(0);
out:
xfs_trans_cancel(trans, XFS_TRANS_RELEASE_LOG_RES);
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, retval;
retval = xfs_attr_shortform_lookup(args);
if ((args->flags & ATTR_REPLACE) && (retval == ENOATTR)) {
return(ENOATTR);
} else if (retval == EEXIST) {
if (args->flags & ATTR_CREATE)
return(EEXIST);
retval = xfs_attr_shortform_remove(args);
ASSERT(retval == 0);
}
newsize = XFS_ATTR_SF_TOTSIZE(args->dp);
newsize += XFS_ATTR_SF_ENTSIZE_BYNAME(args->namelen, args->valuelen);
if ((newsize <= XFS_IFORK_ASIZE(args->dp)) &&
(args->namelen < XFS_ATTR_SF_ENTSIZE_MAX) &&
(args->valuelen < XFS_ATTR_SF_ENTSIZE_MAX)) {
retval = xfs_attr_shortform_add(args);
ASSERT(retval == 0);
} else {
return(ENOSPC);
}
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;
buf_t *bp;
int retval, error, committed;
/*
* 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)) {
return(XFS_ERROR(ENOATTR));
} else if (retval == EEXIST) {
if (args->flags & ATTR_CREATE) { /* pure create op */
return(XFS_ERROR(EEXIST));
}
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);
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) {
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.
*/
xfs_attr_rolltrans(&args->trans, dp);
/*
* 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.
*/
xfs_attr_rolltrans(&args->trans, dp);
/*
* 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 (xfs_attr_shortform_allfit(bp, dp)) {
XFS_BMAP_INIT(args->flist, args->firstblock);
error = xfs_attr_leaf_to_shortform(bp, args);
if (!error) {
error = xfs_bmap_finish(&args->trans,
args->flist,
*args->firstblock,
&committed);
}
if (error) {
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 remove and start the next trans in series.
*/
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;
buf_t *bp;
int committed;
int error;
/*
* 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) {
return(XFS_ERROR(ENOATTR));
}
(void)xfs_attr_leaf_remove(bp, args);
/*
* If the result is small enough, shrink it all into the inode.
*/
if (xfs_attr_shortform_allfit(bp, dp)) {
XFS_BMAP_INIT(args->flist, args->firstblock);
error = xfs_attr_leaf_to_shortform(bp, args);
if (!error) {
error = xfs_bmap_finish(&args->trans, args->flist,
*args->firstblock, &committed);
}
if (error) {
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);
}
}
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)
{
buf_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_trans_brelse(args->trans, bp);
return(error);
}
error = xfs_attr_leaf_getvalue(bp, args);
xfs_trans_brelse(args->trans, bp);
if ((error == 0) && (args->rmtblkno > 0)) {
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;
buf_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 = (xfs_attr_leafblock_t *)bp->b_un.b_addr;
if (leaf->hdr.info.magic != XFS_ATTR_LEAF_MAGIC) {
xfs_trans_brelse(NULL, bp);
return(XFS_ERROR(EDIRCORRUPTED));
}
(void)xfs_attr_leaf_list_int(bp, context);
xfs_trans_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;
state = xfs_da_state_alloc();
state->args = args;
state->mp = mp;
state->blocksize = state->mp->m_sb.sb_blocksize;
restart:
/*
* 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;
}
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_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) {
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.
*/
xfs_attr_rolltrans(&args->trans, dp);
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) {
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);
}
/*
* Commit the leaf addition or btree split and start the next
* trans in the chain.
*/
xfs_attr_rolltrans(&args->trans, dp);
/*
* 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->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) {
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.
*/
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);
if (error)
goto out;
}
retval = error = 0;
out:
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;
buf_t *bp;
int retval, error, committed;
/*
* 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;
/*
* 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;
XFS_ERROR(error);
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.
*/
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) {
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.
*/
xfs_attr_rolltrans(&args->trans, dp);
}
/*
* If the result is small enough, push it all into the inode.
*/
if (xfs_bmap_one_block(dp, XFS_ATTR_FORK)) {
error = xfs_da_read_buf(args->trans, args->dp, 0, -1, &bp,
XFS_ATTR_FORK);
if (error)
goto out;
ASSERT(((xfs_attr_leafblock_t *)bp->b_un.b_addr)->hdr.info.magic
== XFS_ATTR_LEAF_MAGIC);
if (xfs_attr_shortform_allfit(bp, dp)) {
XFS_BMAP_INIT(args->flist, args->firstblock);
error = xfs_attr_leaf_to_shortform(bp, args);
if (!error) {
error = xfs_bmap_finish(&args->trans,
args->flist,
*args->firstblock,
&committed);
}
if (error) {
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);
}
}
}
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 = blk->bp->b_blkno;
} 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 = blk->bp->b_blkno;
} 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(XFS_ERROR(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(XFS_ERROR(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;
/*
* 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 == 0) && (args->rmtblkno > 0)) {
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_trans_brelse(args->trans, state->path.blk[i].bp);
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;
buf_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)
return(error);
if (bp) {
node = (xfs_da_intnode_t *)bp->b_un.b_addr;
switch (node->hdr.info.magic) {
case XFS_DA_NODE_MAGIC:
xfs_attr_trace_l_cn("wrong blk", context, node);
xfs_trans_brelse(NULL, bp);
bp = NULL;
break;
case XFS_ATTR_LEAF_MAGIC:
leaf = (xfs_attr_leafblock_t *)bp->b_un.b_addr;
if (cursor->hashval >
leaf->entries[leaf->hdr.count-1].hashval) {
xfs_attr_trace_l_cl("wrong blk",
context, leaf);
xfs_trans_brelse(NULL, bp);
bp = NULL;
} else if (cursor->hashval <=
leaf->entries[0].hashval) {
xfs_attr_trace_l_cl("maybe wrong blk",
context, leaf);
xfs_trans_brelse(NULL, bp);
bp = NULL;
}
break;
default:
xfs_attr_trace_l_c("wrong blk - ??", context);
xfs_trans_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);
ASSERT(bp != NULL);
node = (xfs_da_intnode_t *)bp->b_un.b_addr;
if (node->hdr.info.magic == XFS_ATTR_LEAF_MAGIC)
break;
if (node->hdr.info.magic != XFS_DA_NODE_MAGIC) {
xfs_trans_brelse(NULL, bp);
return(XFS_ERROR(EDIRCORRUPTED));
}
btree = node->btree;
for (i = 0; i < node->hdr.count; btree++, i++) {
if (cursor->hashval <= btree->hashval) {
cursor->blkno = btree->before;
xfs_attr_trace_l_cb("descending",
context, btree);
break;
}
}
if (i == node->hdr.count) {
xfs_trans_brelse(NULL, bp);
return(0);
}
xfs_trans_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 = (xfs_attr_leafblock_t *)bp->b_un.b_addr;
if (leaf->hdr.info.magic != XFS_ATTR_LEAF_MAGIC) {
xfs_trans_brelse(NULL, bp);
return(XFS_ERROR(EDIRCORRUPTED));
}
error = xfs_attr_leaf_list_int(bp, context);
if (error || (leaf->hdr.info.forw == 0))
break; /* not really an error, buffer full or EOF */
cursor->blkno = leaf->hdr.info.forw;
xfs_trans_brelse(NULL, bp);
error = xfs_da_read_buf(NULL, context->dp, cursor->blkno, -1,
&bp, XFS_ATTR_FORK);
if (error)
return(error);
ASSERT(bp != NULL);
}
xfs_trans_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_fsblock_t firstblock;
xfs_mount_t *mp;
daddr_t dblkno;
caddr_t dst;
buf_t *bp;
int nmap, error, tmp, valuelen, blkcnt, i;
xfs_dablk_t lblkno;
mp = args->dp->i_mount;
dst = args->value;
valuelen = args->valuelen;
lblkno = args->rmtblkno;
while (valuelen > 0) {
firstblock = NULLFSBLOCK;
nmap = ATTR_RMTVALUE_MAPSIZE;
error = xfs_bmapi(args->trans, args->dp, (xfs_fileoff_t)lblkno,
args->rmtblkcnt,
XFS_BMAPI_ATTRFORK | XFS_BMAPI_METADATA,
&firstblock, 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);
bp = read_buf(mp->m_dev, dblkno, blkcnt, 0);
if (error = geterror(bp))
return(error);
tmp = (valuelen < bp->b_bufsize)
? valuelen : bp->b_bufsize;
bcopy(bp->b_un.b_addr, dst, tmp);
brelse(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;
daddr_t dblkno;
caddr_t src;
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);
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, blkcnt, &map, &nmap,
args->flist);
if (!error) {
error = xfs_bmap_finish(&args->trans, args->flist,
*args->firstblock, &committed);
}
if (error) {
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.
*/
xfs_attr_rolltrans(&args->trans, dp);
}
/*
* 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 = get_buf(mp->m_dev, dblkno, blkcnt, 0);
ASSERT(bp);
ASSERT(!geterror(bp));
tmp = (valuelen < bp->b_bufsize) ? valuelen : bp->b_bufsize;
bcopy(src, bp->b_un.b_addr, tmp);
if (tmp < bp->b_bufsize)
bzero(bp->b_un.b_addr + tmp, bp->b_bufsize - tmp);
bwrite(bp); /* GROT: NOTE: synchronous write */
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;
buf_t *bp;
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 = incore(mp->m_dev, dblkno, blkcnt, 1);
if (bp) {
bp->b_flags |= B_STALE;
bp->b_flags &= ~B_DELWRI;
brelse(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) {
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.
*/
xfs_attr_rolltrans(&args->trans, args->dp);
}
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)
? (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)
? (ATTR_ENTRY(context->alist,
context->count-1)->a_valuelen)
: 0,
(__psunsigned_t)context->dupcnt,
(__psunsigned_t)context->flags,
(__psunsigned_t)node->hdr.count,
(__psunsigned_t)node->btree[0].hashval,
(__psunsigned_t)node->btree[node->hdr.count-1].hashval);
}
/*
* 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)
? (ATTR_ENTRY(context->alist,
context->count-1)->a_valuelen)
: 0,
(__psunsigned_t)context->dupcnt,
(__psunsigned_t)context->flags,
(__psunsigned_t)btree->hashval,
(__psunsigned_t)btree->before,
(__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)
? (ATTR_ENTRY(context->alist,
context->count-1)->a_valuelen)
: 0,
(__psunsigned_t)context->dupcnt,
(__psunsigned_t)context->flags,
(__psunsigned_t)leaf->hdr.count,
(__psunsigned_t)leaf->entries[0].hashval,
(__psunsigned_t)leaf->entries[leaf->hdr.count-1].hashval);
}
/*
* 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 */
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