[Ocfs2-devel] [PATCH 40/42] ocfs2: Modify removing xattr process for refcount.
Tao Ma
tao.ma at oracle.com
Thu Apr 2 16:46:19 PDT 2009
The old xattr value remove is quite simple, it just erase the
tree and free the clusters. But as we have added refcount support,
The process is a little complicated.
We have to lock the refcount tree at the beginning, what's more,
we may split the refcount tree in some cases, so meta/credits are
needed.
Signed-off-by: Tao Ma <tao.ma at oracle.com>
---
fs/ocfs2/xattr.c | 170 ++++++++++++++++++++++++++++++++++++++++++-----------
1 files changed, 134 insertions(+), 36 deletions(-)
diff --git a/fs/ocfs2/xattr.c b/fs/ocfs2/xattr.c
index 37c3bef..cfc71c2 100644
--- a/fs/ocfs2/xattr.c
+++ b/fs/ocfs2/xattr.c
@@ -198,6 +198,11 @@ static int ocfs2_prepare_refcount_xattr(struct inode *inode,
struct ocfs2_refcount_tree **ref_tree,
int *meta_need,
int *credits);
+static int ocfs2_get_xattr_tree_value_root(struct super_block *sb,
+ struct ocfs2_xattr_bucket *bucket,
+ int offset,
+ struct ocfs2_xattr_value_root **xv,
+ struct buffer_head **bh);
static inline u16 ocfs2_xattr_buckets_per_cluster(struct ocfs2_super *osb)
{
@@ -1746,51 +1751,106 @@ out:
return ret;
}
+/*
+ * In xattr remove, if it is stored outside and refcounted, we may have
+ * the chance to split the refcount tree. So need the allocators.
+ */
+static int ocfs2_lock_xattr_remove_allocators(struct inode *inode,
+ struct ocfs2_xattr_value_root *xv,
+ struct ocfs2_extent_tree *ref_et,
+ struct ocfs2_alloc_context **meta_ac,
+ int *ref_credits)
+{
+ int ret;
+ u32 p_cluster, num_clusters;
+ unsigned int ext_flags;
+
+ *ref_credits = 0;
+ ret = ocfs2_xattr_get_clusters(inode, 0, &p_cluster,
+ &num_clusters,
+ &xv->xr_list,
+ &ext_flags);
+ if (ret) {
+ mlog_errno(ret);
+ goto out;
+ }
+
+ if (!(ext_flags & OCFS2_EXT_REFCOUNTED))
+ goto out;
+
+ ret = ocfs2_lock_allocators(inode, ref_et, 0,
+ le32_to_cpu(xv->xr_clusters),
+ NULL, meta_ac);
+ if (ret) {
+ mlog_errno(ret);
+ goto out;
+ }
+
+ *ref_credits = ocfs2_calc_extend_credits(inode->i_sb,
+ ref_et->et_root_el,
+ le32_to_cpu(xv->xr_clusters));
+out:
+ return ret;
+}
+
static int ocfs2_remove_value_outside(struct inode*inode,
struct ocfs2_xattr_value_buf *vb,
- struct ocfs2_xattr_header *header)
+ struct ocfs2_xattr_header *header,
+ struct ocfs2_extent_tree *ref_et)
{
- int ret = 0, i;
+ int ret = 0, i, ref_credits;
struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
struct ocfs2_xattr_set_ctxt ctxt = { NULL, NULL, };
+ void *val;
ocfs2_init_dealloc_ctxt(&ctxt.dealloc);
- ctxt.handle = ocfs2_start_trans(osb,
- ocfs2_remove_extent_credits(osb->sb));
- if (IS_ERR(ctxt.handle)) {
- ret = PTR_ERR(ctxt.handle);
- mlog_errno(ret);
- goto out;
- }
-
for (i = 0; i < le16_to_cpu(header->xh_count); i++) {
struct ocfs2_xattr_entry *entry = &header->xh_entries[i];
- if (!ocfs2_xattr_is_local(entry)) {
- void *val;
+ if (ocfs2_xattr_is_local(entry))
+ continue;
- val = (void *)header +
- le16_to_cpu(entry->xe_name_offset);
- vb->vb_xv = (struct ocfs2_xattr_value_root *)
- (val + OCFS2_XATTR_SIZE(entry->xe_name_len));
- ret = ocfs2_xattr_value_truncate(inode, vb, 0, &ctxt);
- if (ret < 0) {
- mlog_errno(ret);
- break;
- }
+ val = (void *)header +
+ le16_to_cpu(entry->xe_name_offset);
+ vb->vb_xv = (struct ocfs2_xattr_value_root *)
+ (val + OCFS2_XATTR_SIZE(entry->xe_name_len));
+
+ ret = ocfs2_lock_xattr_remove_allocators(inode, vb->vb_xv,
+ ref_et, &ctxt.meta_ac,
+ &ref_credits);
+
+ ctxt.handle = ocfs2_start_trans(osb, ref_credits +
+ ocfs2_remove_extent_credits(osb->sb));
+ if (IS_ERR(ctxt.handle)) {
+ ret = PTR_ERR(ctxt.handle);
+ mlog_errno(ret);
+ break;
+ }
+
+ ret = ocfs2_xattr_value_truncate(inode, vb, 0, &ctxt);
+ if (ret < 0) {
+ mlog_errno(ret);
+ break;
+ }
+
+ ocfs2_commit_trans(osb, ctxt.handle);
+ if (ctxt.meta_ac) {
+ ocfs2_free_alloc_context(ctxt.meta_ac);
+ ctxt.meta_ac = NULL;
}
}
- ocfs2_commit_trans(osb, ctxt.handle);
+ if (ctxt.meta_ac)
+ ocfs2_free_alloc_context(ctxt.meta_ac);
ocfs2_schedule_truncate_log_flush(osb, 1);
ocfs2_run_deallocs(osb, &ctxt.dealloc);
-out:
return ret;
}
static int ocfs2_xattr_ibody_remove(struct inode *inode,
- struct buffer_head *di_bh)
+ struct buffer_head *di_bh,
+ struct ocfs2_extent_tree *ref_et)
{
struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
@@ -1805,13 +1865,14 @@ static int ocfs2_xattr_ibody_remove(struct inode *inode,
((void *)di + inode->i_sb->s_blocksize -
le16_to_cpu(di->i_xattr_inline_size));
- ret = ocfs2_remove_value_outside(inode, &vb, header);
+ ret = ocfs2_remove_value_outside(inode, &vb, header, ref_et);
return ret;
}
static int ocfs2_xattr_block_remove(struct inode *inode,
- struct buffer_head *blk_bh)
+ struct buffer_head *blk_bh,
+ struct ocfs2_extent_tree *ref_et)
{
struct ocfs2_xattr_block *xb;
int ret = 0;
@@ -1823,18 +1884,19 @@ static int ocfs2_xattr_block_remove(struct inode *inode,
xb = (struct ocfs2_xattr_block *)blk_bh->b_data;
if (!(le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED)) {
struct ocfs2_xattr_header *header = &(xb->xb_attrs.xb_header);
- ret = ocfs2_remove_value_outside(inode, &vb, header);
+ ret = ocfs2_remove_value_outside(inode, &vb, header, ref_et);
} else
ret = ocfs2_iterate_xattr_index_block(inode,
blk_bh,
ocfs2_rm_xattr_cluster,
- NULL);
+ ref_et);
return ret;
}
static int ocfs2_xattr_free_block(struct inode *inode,
- u64 block)
+ u64 block,
+ struct ocfs2_extent_tree *ref_et)
{
struct inode *xb_alloc_inode;
struct buffer_head *xb_alloc_bh = NULL;
@@ -1852,7 +1914,7 @@ static int ocfs2_xattr_free_block(struct inode *inode,
goto out;
}
- ret = ocfs2_xattr_block_remove(inode, blk_bh);
+ ret = ocfs2_xattr_block_remove(inode, blk_bh, ref_et);
if (ret < 0) {
mlog_errno(ret);
goto out;
@@ -1912,6 +1974,9 @@ int ocfs2_xattr_remove(struct inode *inode, struct buffer_head *di_bh)
{
struct ocfs2_inode_info *oi = OCFS2_I(inode);
struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
+ struct ocfs2_refcount_tree *ref_tree = NULL;
+ struct buffer_head *ref_bh = NULL;
+ struct ocfs2_extent_tree ref_et;
handle_t *handle;
int ret;
@@ -1921,8 +1986,22 @@ int ocfs2_xattr_remove(struct inode *inode, struct buffer_head *di_bh)
if (!(oi->ip_dyn_features & OCFS2_HAS_XATTR_FL))
return 0;
+ memset(&ref_et, 0, sizeof(ref_et));
+ if (OCFS2_I(inode)->ip_dyn_features & OCFS2_HAS_REFCOUNT_FL) {
+ ret = ocfs2_lock_refcount_tree(OCFS2_SB(inode->i_sb),
+ le64_to_cpu(di->i_refcount_loc),
+ 1, &ref_tree, &ref_bh);
+ if (ret) {
+ mlog_errno(ret);
+ goto out;
+ }
+
+ ocfs2_init_refcount_extent_tree(&ref_et,
+ &ref_tree->rf_ci, ref_bh);
+ }
+
if (oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL) {
- ret = ocfs2_xattr_ibody_remove(inode, di_bh);
+ ret = ocfs2_xattr_ibody_remove(inode, di_bh, &ref_et);
if (ret < 0) {
mlog_errno(ret);
goto out;
@@ -1931,7 +2010,8 @@ int ocfs2_xattr_remove(struct inode *inode, struct buffer_head *di_bh)
if (di->i_xattr_loc) {
ret = ocfs2_xattr_free_block(inode,
- le64_to_cpu(di->i_xattr_loc));
+ le64_to_cpu(di->i_xattr_loc),
+ &ref_et);
if (ret < 0) {
mlog_errno(ret);
goto out;
@@ -1965,6 +2045,9 @@ int ocfs2_xattr_remove(struct inode *inode, struct buffer_head *di_bh)
out_commit:
ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
out:
+ if (ref_tree)
+ ocfs2_unlock_refcount_tree(OCFS2_SB(inode->i_sb), ref_tree, 1);
+ brelse(ref_bh);
return ret;
}
@@ -4987,7 +5070,7 @@ static int ocfs2_rm_xattr_cluster(struct inode *inode,
struct ocfs2_extent_tree et;
ret = ocfs2_iterate_xattr_buckets(inode, blkno, len,
- ocfs2_delete_xattr_in_bucket, NULL);
+ ocfs2_delete_xattr_in_bucket, para);
if (ret) {
mlog_errno(ret);
return ret;
@@ -5375,7 +5458,7 @@ static int ocfs2_delete_xattr_in_bucket(struct inode *inode,
struct ocfs2_xattr_bucket *bucket,
void *para)
{
- int ret = 0;
+ int ret = 0, ref_credits;
struct ocfs2_xattr_header *xh = bucket_xh(bucket);
u16 i;
struct ocfs2_xattr_entry *xe;
@@ -5383,7 +5466,9 @@ static int ocfs2_delete_xattr_in_bucket(struct inode *inode,
struct ocfs2_xattr_set_ctxt ctxt = {NULL, NULL,};
int credits = ocfs2_remove_extent_credits(osb->sb) +
ocfs2_blocks_per_xattr_bucket(inode->i_sb);
-
+ struct ocfs2_xattr_value_root *xv;
+ struct ocfs2_extent_tree *ref_et =
+ (struct ocfs2_extent_tree *)para;
ocfs2_init_dealloc_ctxt(&ctxt.dealloc);
@@ -5392,7 +5477,14 @@ static int ocfs2_delete_xattr_in_bucket(struct inode *inode,
if (ocfs2_xattr_is_local(xe))
continue;
- ctxt.handle = ocfs2_start_trans(osb, credits);
+ ret = ocfs2_get_xattr_tree_value_root(inode->i_sb, bucket,
+ i, &xv, NULL);
+
+ ret = ocfs2_lock_xattr_remove_allocators(inode, xv,
+ ref_et, &ctxt.meta_ac,
+ &ref_credits);
+
+ ctxt.handle = ocfs2_start_trans(osb, credits + ref_credits);
if (IS_ERR(ctxt.handle)) {
ret = PTR_ERR(ctxt.handle);
mlog_errno(ret);
@@ -5403,12 +5495,18 @@ static int ocfs2_delete_xattr_in_bucket(struct inode *inode,
i, 0, &ctxt);
ocfs2_commit_trans(osb, ctxt.handle);
+ if (ctxt.meta_ac) {
+ ocfs2_free_alloc_context(ctxt.meta_ac);
+ ctxt.meta_ac = NULL;
+ }
if (ret) {
mlog_errno(ret);
break;
}
}
+ if (ctxt.meta_ac)
+ ocfs2_free_alloc_context(ctxt.meta_ac);
ocfs2_schedule_truncate_log_flush(osb, 1);
ocfs2_run_deallocs(osb, &ctxt.dealloc);
return ret;
--
1.6.2.rc2.16.gf474c
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