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xfs: pass along transaction context when reading xattr block buffers 

Teach the extended attribute reading functions to pass along a
transaction context if one was supplied.  The extended attribute scrub
code will use transactions to lock buffers and avoid deadlocking with
itself in the case of loops; since it will already have the inode
locked, also create xattr get/list helpers that don't take locks.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Brian Foster <bfoster@redhat.com>
This commit is contained in:
Darrick J. Wong 2017-06-16 11:00:14 -07:00
parent acb9553cab
commit ad017f6537
4 changed files with 57 additions and 36 deletions
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26
fs/xfs/libxfs/xfs_attr.c
View File

@ -114,6 +114,23 @@ xfs_inode_hasattr(
* Overall external interface routines.
*========================================================================*/
/* Retrieve an extended attribute and its value. Must have iolock. */
int
xfs_attr_get_ilocked(
struct xfs_inode *ip,
struct xfs_da_args *args)
{
if (!xfs_inode_hasattr(ip))
return -ENOATTR;
else if (ip->i_d.di_aformat == XFS_DINODE_FMT_LOCAL)
return xfs_attr_shortform_getvalue(args);
else if (xfs_bmap_one_block(ip, XFS_ATTR_FORK))
return xfs_attr_leaf_get(args);
else
return xfs_attr_node_get(args);
}
/* Retrieve an extended attribute by name, and its value. */
int
xfs_attr_get(
struct xfs_inode *ip,
@ -141,14 +158,7 @@ xfs_attr_get(
args.op_flags = XFS_DA_OP_OKNOENT;
lock_mode = xfs_ilock_attr_map_shared(ip);
if (!xfs_inode_hasattr(ip))
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);
error = xfs_attr_get_ilocked(ip, &args);
xfs_iunlock(ip, lock_mode);
*valuelenp = args.valuelen;

5
fs/xfs/libxfs/xfs_attr_remote.c
View File

@ -386,7 +386,8 @@ xfs_attr_rmtval_get(
(map[i].br_startblock != HOLESTARTBLOCK));
dblkno = XFS_FSB_TO_DADDR(mp, map[i].br_startblock);
dblkcnt = XFS_FSB_TO_BB(mp, map[i].br_blockcount);
error = xfs_trans_read_buf(mp, NULL, mp->m_ddev_targp,
error = xfs_trans_read_buf(mp, args->trans,
mp->m_ddev_targp,
dblkno, dblkcnt, 0, &bp,
&xfs_attr3_rmt_buf_ops);
if (error)
@ -395,7 +396,7 @@ xfs_attr_rmtval_get(
error = xfs_attr_rmtval_copyout(mp, bp, args->dp->i_ino,
&offset, &valuelen,
&dst);
xfs_buf_relse(bp);
xfs_trans_brelse(args->trans, bp);
if (error)
return error;

3
fs/xfs/xfs_attr.h
View File

@ -117,6 +117,7 @@ typedef void (*put_listent_func_t)(struct xfs_attr_list_context *, int,
unsigned char *, int, int);
typedef struct xfs_attr_list_context {
struct xfs_trans *tp;
struct xfs_inode *dp; /* inode */
struct attrlist_cursor_kern *cursor; /* position in list */
char *alist; /* output buffer */
@ -140,8 +141,10 @@ typedef struct xfs_attr_list_context {
* Overall external interface routines.
*/
int xfs_attr_inactive(struct xfs_inode *dp);
int xfs_attr_list_int_ilocked(struct xfs_attr_list_context *);
int xfs_attr_list_int(struct xfs_attr_list_context *);
int xfs_inode_hasattr(struct xfs_inode *ip);
int xfs_attr_get_ilocked(struct xfs_inode *ip, struct xfs_da_args *args);
int xfs_attr_get(struct xfs_inode *ip, const unsigned char *name,
unsigned char *value, int *valuelenp, int flags);
int xfs_attr_set(struct xfs_inode *dp, const unsigned char *name,

59
fs/xfs/xfs_attr_list.c
View File

@ -230,7 +230,7 @@ xfs_attr_node_list(xfs_attr_list_context_t *context)
*/
bp = NULL;
if (cursor->blkno > 0) {
error = xfs_da3_node_read(NULL, dp, cursor->blkno, -1,
error = xfs_da3_node_read(context->tp, dp, cursor->blkno, -1,
&bp, XFS_ATTR_FORK);
if ((error != 0) && (error != -EFSCORRUPTED))
return error;
@ -242,7 +242,7 @@ xfs_attr_node_list(xfs_attr_list_context_t *context)
case XFS_DA_NODE_MAGIC:
case XFS_DA3_NODE_MAGIC:
trace_xfs_attr_list_wrong_blk(context);
xfs_trans_brelse(NULL, bp);
xfs_trans_brelse(context->tp, bp);
bp = NULL;
break;
case XFS_ATTR_LEAF_MAGIC:
@ -254,18 +254,18 @@ xfs_attr_node_list(xfs_attr_list_context_t *context)
if (cursor->hashval > be32_to_cpu(
entries[leafhdr.count - 1].hashval)) {
trace_xfs_attr_list_wrong_blk(context);
xfs_trans_brelse(NULL, bp);
xfs_trans_brelse(context->tp, bp);
bp = NULL;
} else if (cursor->hashval <= be32_to_cpu(
entries[0].hashval)) {
trace_xfs_attr_list_wrong_blk(context);
xfs_trans_brelse(NULL, bp);
xfs_trans_brelse(context->tp, bp);
bp = NULL;
}
break;
default:
trace_xfs_attr_list_wrong_blk(context);
xfs_trans_brelse(NULL, bp);
xfs_trans_brelse(context->tp, bp);
bp = NULL;
}
}
@ -281,7 +281,7 @@ xfs_attr_node_list(xfs_attr_list_context_t *context)
for (;;) {
uint16_t magic;
error = xfs_da3_node_read(NULL, dp,
error = xfs_da3_node_read(context->tp, dp,
cursor->blkno, -1, &bp,
XFS_ATTR_FORK);
if (error)
@ -297,7 +297,7 @@ xfs_attr_node_list(xfs_attr_list_context_t *context)
XFS_ERRLEVEL_LOW,
context->dp->i_mount,
node);
xfs_trans_brelse(NULL, bp);
xfs_trans_brelse(context->tp, bp);
return -EFSCORRUPTED;
}
@ -313,10 +313,10 @@ xfs_attr_node_list(xfs_attr_list_context_t *context)
}
}
if (i == nodehdr.count) {
xfs_trans_brelse(NULL, bp);
xfs_trans_brelse(context->tp, bp);
return 0;
}
xfs_trans_brelse(NULL, bp);
xfs_trans_brelse(context->tp, bp);
}
}
ASSERT(bp != NULL);
@ -333,12 +333,12 @@ xfs_attr_node_list(xfs_attr_list_context_t *context)
if (context->seen_enough || leafhdr.forw == 0)
break;
cursor->blkno = leafhdr.forw;
xfs_trans_brelse(NULL, bp);
error = xfs_attr3_leaf_read(NULL, dp, cursor->blkno, -1, &bp);
xfs_trans_brelse(context->tp, bp);
error = xfs_attr3_leaf_read(context->tp, dp, cursor->blkno, -1, &bp);
if (error)
return error;
}
xfs_trans_brelse(NULL, bp);
xfs_trans_brelse(context->tp, bp);
return 0;
}
@ -448,15 +448,33 @@ xfs_attr_leaf_list(xfs_attr_list_context_t *context)
trace_xfs_attr_leaf_list(context);
context->cursor->blkno = 0;
error = xfs_attr3_leaf_read(NULL, context->dp, 0, -1, &bp);
error = xfs_attr3_leaf_read(context->tp, context->dp, 0, -1, &bp);
if (error)
return error;
xfs_attr3_leaf_list_int(bp, context);
xfs_trans_brelse(NULL, bp);
xfs_trans_brelse(context->tp, bp);
return 0;
}
int
xfs_attr_list_int_ilocked(
struct xfs_attr_list_context *context)
{
struct xfs_inode *dp = context->dp;
/*
* Decide on what work routines to call based on the inode size.
*/
if (!xfs_inode_hasattr(dp))
return 0;
else if (dp->i_d.di_aformat == XFS_DINODE_FMT_LOCAL)
return xfs_attr_shortform_list(context);
else if (xfs_bmap_one_block(dp, XFS_ATTR_FORK))
return xfs_attr_leaf_list(context);
return xfs_attr_node_list(context);
}
int
xfs_attr_list_int(
xfs_attr_list_context_t *context)
@ -470,19 +488,8 @@ xfs_attr_list_int(
if (XFS_FORCED_SHUTDOWN(dp->i_mount))
return -EIO;
/*
* Decide on what work routines to call based on the inode size.
*/
lock_mode = xfs_ilock_attr_map_shared(dp);
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);
}
error = xfs_attr_list_int_ilocked(context);
xfs_iunlock(dp, lock_mode);
return error;
}