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xfs: factor and verify attr leaf reads

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Some reads are not converted yet because it isn't obvious ahead of
time what the format of the block is going to be. Need to determine
how to tell if the first block in the tree is a node or leaf format
block. That will be done in later patches.

Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Phil White <pwhite@sgi.com>
Signed-off-by: Ben Myers <bpm@sgi.com>
This commit is contained in:
Dave Chinner 2012-11-12 22:54:16 +11:00 committed by Ben Myers
parent e6f7667c4e
commit ad14c33ac8
3 changed files with 66 additions and 85 deletions
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70
fs/xfs/xfs_attr.c
View File

@ -903,11 +903,9 @@ xfs_attr_leaf_addname(xfs_da_args_t *args)
*/
dp = args->dp;
args->blkno = 0;
error = xfs_da_read_buf(args->trans, args->dp, args->blkno, -1, &bp,
XFS_ATTR_FORK, NULL);
error = xfs_attr_leaf_read(args->trans, args->dp, args->blkno, -1, &bp);
if (error)
return(error);
ASSERT(bp != NULL);
return error;
/*
* Look up the given attribute in the leaf block. Figure out if
@ -1031,12 +1029,12 @@ xfs_attr_leaf_addname(xfs_da_args_t *args)
* 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, NULL);
error = xfs_attr_leaf_read(args->trans, args->dp, args->blkno,
-1, &bp);
if (error)
return(error);
ASSERT(bp != NULL);
(void)xfs_attr_leaf_remove(bp, args);
return error;
xfs_attr_leaf_remove(bp, args);
/*
* If the result is small enough, shrink it all into the inode.
@ -1100,20 +1098,17 @@ xfs_attr_leaf_removename(xfs_da_args_t *args)
*/
dp = args->dp;
args->blkno = 0;
error = xfs_da_read_buf(args->trans, args->dp, args->blkno, -1, &bp,
XFS_ATTR_FORK, NULL);
if (error) {
return(error);
}
error = xfs_attr_leaf_read(args->trans, args->dp, args->blkno, -1, &bp);
if (error)
return error;
ASSERT(bp != NULL);
error = xfs_attr_leaf_lookup_int(bp, args);
if (error == ENOATTR) {
xfs_trans_brelse(args->trans, bp);
return(error);
}
(void)xfs_attr_leaf_remove(bp, args);
xfs_attr_leaf_remove(bp, args);
/*
* If the result is small enough, shrink it all into the inode.
@ -1158,11 +1153,9 @@ xfs_attr_leaf_get(xfs_da_args_t *args)
trace_xfs_attr_leaf_get(args);
args->blkno = 0;
error = xfs_da_read_buf(args->trans, args->dp, args->blkno, -1, &bp,
XFS_ATTR_FORK, NULL);
error = xfs_attr_leaf_read(args->trans, args->dp, args->blkno, -1, &bp);
if (error)
return(error);
ASSERT(bp != NULL);
return error;
error = xfs_attr_leaf_lookup_int(bp, args);
if (error != EEXIST) {
@ -1183,25 +1176,15 @@ xfs_attr_leaf_get(xfs_da_args_t *args)
STATIC int
xfs_attr_leaf_list(xfs_attr_list_context_t *context)
{
xfs_attr_leafblock_t *leaf;
int error;
struct xfs_buf *bp;
trace_xfs_attr_leaf_list(context);
context->cursor->blkno = 0;
error = xfs_da_read_buf(NULL, context->dp, 0, -1, &bp, XFS_ATTR_FORK,
NULL);
error = xfs_attr_leaf_read(NULL, context->dp, 0, -1, &bp);
if (error)
return XFS_ERROR(error);
ASSERT(bp != NULL);
leaf = bp->b_addr;
if (unlikely(leaf->hdr.info.magic != cpu_to_be16(XFS_ATTR_LEAF_MAGIC))) {
XFS_CORRUPTION_ERROR("xfs_attr_leaf_list", XFS_ERRLEVEL_LOW,
context->dp->i_mount, leaf);
xfs_trans_brelse(NULL, bp);
return XFS_ERROR(EFSCORRUPTED);
}
error = xfs_attr_leaf_list_int(bp, context);
xfs_trans_brelse(NULL, bp);
@ -1605,12 +1588,9 @@ xfs_attr_node_removename(xfs_da_args_t *args)
ASSERT(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, NULL);
error = xfs_attr_leaf_read(args->trans, args->dp, 0, -1, &bp);
if (error)
goto out;
ASSERT((((xfs_attr_leafblock_t *)bp->b_addr)->hdr.info.magic) ==
cpu_to_be16(XFS_ATTR_LEAF_MAGIC));
if ((forkoff = xfs_attr_shortform_allfit(bp, dp))) {
xfs_bmap_init(args->flist, args->firstblock);
@ -1920,14 +1900,6 @@ xfs_attr_node_list(xfs_attr_list_context_t *context)
*/
for (;;) {
leaf = bp->b_addr;
if (unlikely(leaf->hdr.info.magic !=
cpu_to_be16(XFS_ATTR_LEAF_MAGIC))) {
XFS_CORRUPTION_ERROR("xfs_attr_node_list(4)",
XFS_ERRLEVEL_LOW,
context->dp->i_mount, leaf);
xfs_trans_brelse(NULL, bp);
return(XFS_ERROR(EFSCORRUPTED));
}
error = xfs_attr_leaf_list_int(bp, context);
if (error) {
xfs_trans_brelse(NULL, bp);
@ -1937,16 +1909,10 @@ xfs_attr_node_list(xfs_attr_list_context_t *context)
break;
cursor->blkno = be32_to_cpu(leaf->hdr.info.forw);
xfs_trans_brelse(NULL, bp);
error = xfs_da_read_buf(NULL, context->dp, cursor->blkno, -1,
&bp, XFS_ATTR_FORK, NULL);
error = xfs_attr_leaf_read(NULL, context->dp, cursor->blkno, -1,
&bp);
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));
}
return error;
}
xfs_trans_brelse(NULL, bp);
return(0);

78
fs/xfs/xfs_attr_leaf.c
View File

@ -88,6 +88,36 @@ STATIC void xfs_attr_leaf_moveents(xfs_attr_leafblock_t *src_leaf,
xfs_mount_t *mp);
STATIC int xfs_attr_leaf_entsize(xfs_attr_leafblock_t *leaf, int index);
static void
xfs_attr_leaf_verify(
struct xfs_buf *bp)
{
struct xfs_mount *mp = bp->b_target->bt_mount;
struct xfs_attr_leaf_hdr *hdr = bp->b_addr;
int block_ok = 0;
block_ok = hdr->info.magic == cpu_to_be16(XFS_ATTR_LEAF_MAGIC);
if (!block_ok) {
XFS_CORRUPTION_ERROR(__func__, XFS_ERRLEVEL_LOW, mp, hdr);
xfs_buf_ioerror(bp, EFSCORRUPTED);
}
bp->b_iodone = NULL;
xfs_buf_ioend(bp, 0);
}
int
xfs_attr_leaf_read(
struct xfs_trans *tp,
struct xfs_inode *dp,
xfs_dablk_t bno,
xfs_daddr_t mappedbno,
struct xfs_buf **bpp)
{
return xfs_da_read_buf(tp, dp, bno, mappedbno, bpp,
XFS_ATTR_FORK, xfs_attr_leaf_verify);
}
/*========================================================================
* Namespace helper routines
*========================================================================*/
@ -870,11 +900,10 @@ xfs_attr_leaf_to_node(xfs_da_args_t *args)
error = xfs_da_grow_inode(args, &blkno);
if (error)
goto out;
error = xfs_da_read_buf(args->trans, args->dp, 0, -1, &bp1,
XFS_ATTR_FORK, NULL);
error = xfs_attr_leaf_read(args->trans, args->dp, 0, -1, &bp1);
if (error)
goto out;
ASSERT(bp1 != NULL);
bp2 = NULL;
error = xfs_da_get_buf(args->trans, args->dp, blkno, -1, &bp2,
XFS_ATTR_FORK);
@ -1641,18 +1670,16 @@ xfs_attr_leaf_toosmall(xfs_da_state_t *state, int *action)
blkno = be32_to_cpu(info->back);
if (blkno == 0)
continue;
error = xfs_da_read_buf(state->args->trans, state->args->dp,
blkno, -1, &bp, XFS_ATTR_FORK, NULL);
error = xfs_attr_leaf_read(state->args->trans, state->args->dp,
blkno, -1, &bp);
if (error)
return(error);
ASSERT(bp != NULL);
leaf = (xfs_attr_leafblock_t *)info;
count = be16_to_cpu(leaf->hdr.count);
bytes = state->blocksize - (state->blocksize>>2);
bytes -= be16_to_cpu(leaf->hdr.usedbytes);
leaf = bp->b_addr;
ASSERT(leaf->hdr.info.magic == cpu_to_be16(XFS_ATTR_LEAF_MAGIC));
count += be16_to_cpu(leaf->hdr.count);
bytes -= be16_to_cpu(leaf->hdr.usedbytes);
bytes -= count * sizeof(xfs_attr_leaf_entry_t);
@ -2518,15 +2545,11 @@ xfs_attr_leaf_clearflag(xfs_da_args_t *args)
/*
* Set up the operation.
*/
error = xfs_da_read_buf(args->trans, args->dp, args->blkno, -1, &bp,
XFS_ATTR_FORK, NULL);
if (error) {
error = xfs_attr_leaf_read(args->trans, args->dp, args->blkno, -1, &bp);
if (error)
return(error);
}
ASSERT(bp != NULL);
leaf = bp->b_addr;
ASSERT(leaf->hdr.info.magic == cpu_to_be16(XFS_ATTR_LEAF_MAGIC));
ASSERT(args->index < be16_to_cpu(leaf->hdr.count));
ASSERT(args->index >= 0);
entry = &leaf->entries[ args->index ];
@ -2583,15 +2606,11 @@ xfs_attr_leaf_setflag(xfs_da_args_t *args)
/*
* Set up the operation.
*/
error = xfs_da_read_buf(args->trans, args->dp, args->blkno, -1, &bp,
XFS_ATTR_FORK, NULL);
if (error) {
error = xfs_attr_leaf_read(args->trans, args->dp, args->blkno, -1, &bp);
if (error)
return(error);
}
ASSERT(bp != NULL);
leaf = bp->b_addr;
ASSERT(leaf->hdr.info.magic == cpu_to_be16(XFS_ATTR_LEAF_MAGIC));
ASSERT(args->index < be16_to_cpu(leaf->hdr.count));
ASSERT(args->index >= 0);
entry = &leaf->entries[ args->index ];
@ -2640,35 +2659,28 @@ xfs_attr_leaf_flipflags(xfs_da_args_t *args)
/*
* Read the block containing the "old" attr
*/
error = xfs_da_read_buf(args->trans, args->dp, args->blkno, -1, &bp1,
XFS_ATTR_FORK, NULL);
if (error) {
return(error);
}
ASSERT(bp1 != NULL);
error = xfs_attr_leaf_read(args->trans, args->dp, args->blkno, -1, &bp1);
if (error)
return error;
/*
* Read the block containing the "new" attr, if it is different
*/
if (args->blkno2 != args->blkno) {
error = xfs_da_read_buf(args->trans, args->dp, args->blkno2,
-1, &bp2, XFS_ATTR_FORK, NULL);
if (error) {
return(error);
}
ASSERT(bp2 != NULL);
error = xfs_attr_leaf_read(args->trans, args->dp, args->blkno2,
-1, &bp2);
if (error)
return error;
} else {
bp2 = bp1;
}
leaf1 = bp1->b_addr;
ASSERT(leaf1->hdr.info.magic == cpu_to_be16(XFS_ATTR_LEAF_MAGIC));
ASSERT(args->index < be16_to_cpu(leaf1->hdr.count));
ASSERT(args->index >= 0);
entry1 = &leaf1->entries[ args->index ];
leaf2 = bp2->b_addr;
ASSERT(leaf2->hdr.info.magic == cpu_to_be16(XFS_ATTR_LEAF_MAGIC));
ASSERT(args->index2 < be16_to_cpu(leaf2->hdr.count));
ASSERT(args->index2 >= 0);
entry2 = &leaf2->entries[ args->index2 ];

3
fs/xfs/xfs_attr_leaf.h
View File

@ -227,6 +227,9 @@ int xfs_attr_leaf_to_shortform(struct xfs_buf *bp,
int xfs_attr_leaf_clearflag(struct xfs_da_args *args);
int xfs_attr_leaf_setflag(struct xfs_da_args *args);
int xfs_attr_leaf_flipflags(xfs_da_args_t *args);
int xfs_attr_leaf_read(struct xfs_trans *tp, struct xfs_inode *dp,
xfs_dablk_t bno, xfs_daddr_t mappedbno,
struct xfs_buf **bpp);
/*
* Routines used for growing the Btree.