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author | Joel Becker <joel.becker@oracle.com> | 2009-08-18 21:03:24 -0700 |
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committer | Joel Becker <joel.becker@oracle.com> | 2010-02-26 15:41:12 -0800 |
commit | c5d95df5f78312c879f3058059c98a08821897a5 (patch) | |
tree | ae8b3549b50a664b1f48d8608488362a8597d9a5 /fs | |
parent | bca5e9bd1eb2a9422a2ff29e822a956310653754 (diff) | |
download | linux-stable-c5d95df5f78312c879f3058059c98a08821897a5.tar.gz linux-stable-c5d95df5f78312c879f3058059c98a08821897a5.tar.bz2 linux-stable-c5d95df5f78312c879f3058059c98a08821897a5.zip |
ocfs2: Let ocfs2_xa_prepare_entry() do space checks.
ocfs2_xattr_set_in_bucket() doesn't need to do its own hacky space
checking. Let's let ocfs2_xa_prepare_entry() (via ocfs2_xa_set()) do
the more accurate work. Whenever it doesn't have space,
ocfs2_xattr_set_in_bucket() can try to get more space.
Signed-off-by: Joel Becker <joel.becker@oracle.com>
Diffstat (limited to 'fs')
-rw-r--r-- | fs/ocfs2/xattr.c | 270 |
1 files changed, 93 insertions, 177 deletions
diff --git a/fs/ocfs2/xattr.c b/fs/ocfs2/xattr.c index 98c18fbfc289..e7630a77a6c8 100644 --- a/fs/ocfs2/xattr.c +++ b/fs/ocfs2/xattr.c @@ -322,14 +322,6 @@ static inline u16 ocfs2_blocks_per_xattr_bucket(struct super_block *sb) return OCFS2_XATTR_BUCKET_SIZE / (1 << sb->s_blocksize_bits); } -static inline u16 ocfs2_xattr_max_xe_in_bucket(struct super_block *sb) -{ - u16 len = sb->s_blocksize - - offsetof(struct ocfs2_xattr_header, xh_entries); - - return len / sizeof(struct ocfs2_xattr_entry); -} - #define bucket_blkno(_b) ((_b)->bu_bhs[0]->b_blocknr) #define bucket_block(_b, _n) ((_b)->bu_bhs[(_n)]->b_data) #define bucket_xh(_b) ((struct ocfs2_xattr_header *)bucket_block((_b), 0)) @@ -5418,42 +5410,6 @@ out: } /* - * Set the xattr name/value in the bucket specified in xs. - */ -static int ocfs2_xattr_set_in_bucket(struct inode *inode, - struct ocfs2_xattr_info *xi, - struct ocfs2_xattr_search *xs, - struct ocfs2_xattr_set_ctxt *ctxt) -{ - int ret; - u64 blkno; - struct ocfs2_xa_loc loc; - - if (!xs->bucket->bu_bhs[1]) { - blkno = bucket_blkno(xs->bucket); - ocfs2_xattr_bucket_relse(xs->bucket); - ret = ocfs2_read_xattr_bucket(xs->bucket, blkno); - if (ret) { - mlog_errno(ret); - goto out; - } - } - - ocfs2_init_xattr_bucket_xa_loc(&loc, xs->bucket, - xs->not_found ? NULL : xs->here); - ret = ocfs2_xa_set(&loc, xi, ctxt); - if (ret) { - if (ret != -ENOSPC) - mlog_errno(ret); - goto out; - } - xs->here = loc.xl_entry; - -out: - return ret; -} - -/* * check whether the xattr bucket is filled up with the same hash value. * If we want to insert the xattr with the same hash, return -ENOSPC. * If we want to insert a xattr with different hash value, go ahead @@ -5481,156 +5437,116 @@ static int ocfs2_check_xattr_bucket_collision(struct inode *inode, return 0; } -static int ocfs2_xattr_set_entry_index_block(struct inode *inode, - struct ocfs2_xattr_info *xi, - struct ocfs2_xattr_search *xs, - struct ocfs2_xattr_set_ctxt *ctxt) +/* + * Try to set the entry in the current bucket. If we fail, the caller + * will handle getting us another bucket. + */ +static int ocfs2_xattr_set_entry_bucket(struct inode *inode, + struct ocfs2_xattr_info *xi, + struct ocfs2_xattr_search *xs, + struct ocfs2_xattr_set_ctxt *ctxt) { - struct ocfs2_xattr_header *xh; - struct ocfs2_xattr_entry *xe; - u16 count, header_size, xh_free_start; - int free, max_free, need, old; - size_t value_size = 0; - size_t blocksize = inode->i_sb->s_blocksize; - int ret, allocation = 0; - - mlog_entry("Set xattr %s in xattr index block\n", xi->xi_name); - -try_again: - xh = xs->header; - count = le16_to_cpu(xh->xh_count); - xh_free_start = le16_to_cpu(xh->xh_free_start); - header_size = sizeof(struct ocfs2_xattr_header) + - count * sizeof(struct ocfs2_xattr_entry); - max_free = OCFS2_XATTR_BUCKET_SIZE - header_size - - le16_to_cpu(xh->xh_name_value_len) - OCFS2_XATTR_HEADER_GAP; - - mlog_bug_on_msg(header_size > blocksize, "bucket %llu has header size " - "of %u which exceed block size\n", - (unsigned long long)bucket_blkno(xs->bucket), - header_size); + int ret; + struct ocfs2_xa_loc loc; - if (xi->xi_value && xi->xi_value_len > OCFS2_XATTR_INLINE_SIZE) - value_size = OCFS2_XATTR_ROOT_SIZE; - else if (xi->xi_value) - value_size = OCFS2_XATTR_SIZE(xi->xi_value_len); + mlog_entry("Set xattr %s in xattr bucket\n", xi->xi_name); - if (xs->not_found) - need = sizeof(struct ocfs2_xattr_entry) + - OCFS2_XATTR_SIZE(xi->xi_name_len) + value_size; - else { - need = value_size + OCFS2_XATTR_SIZE(xi->xi_name_len); + ocfs2_init_xattr_bucket_xa_loc(&loc, xs->bucket, + xs->not_found ? NULL : xs->here); + ret = ocfs2_xa_set(&loc, xi, ctxt); + if (!ret) { + xs->here = loc.xl_entry; + goto out; + } + if (ret != -ENOSPC) { + mlog_errno(ret); + goto out; + } - /* - * We only replace the old value if the new length is smaller - * than the old one. Otherwise we will allocate new space in the - * bucket to store it. - */ - xe = xs->here; - if (ocfs2_xattr_is_local(xe)) - old = OCFS2_XATTR_SIZE(le64_to_cpu(xe->xe_value_size)); - else - old = OCFS2_XATTR_SIZE(OCFS2_XATTR_ROOT_SIZE); + /* Ok, we need space. Let's try defragmenting the bucket. */ + ret = ocfs2_defrag_xattr_bucket(inode, ctxt->handle, + xs->bucket); + if (ret) { + mlog_errno(ret); + goto out; + } - if (old >= value_size) - need = 0; + ret = ocfs2_xa_set(&loc, xi, ctxt); + if (!ret) { + xs->here = loc.xl_entry; + goto out; } + if (ret != -ENOSPC) + mlog_errno(ret); - free = xh_free_start - header_size - OCFS2_XATTR_HEADER_GAP; - /* - * We need to make sure the new name/value pair - * can exist in the same block. - */ - if (xh_free_start % blocksize < need) - free -= xh_free_start % blocksize; - - mlog(0, "xs->not_found = %d, in xattr bucket %llu: free = %d, " - "need = %d, max_free = %d, xh_free_start = %u, xh_name_value_len =" - " %u\n", xs->not_found, - (unsigned long long)bucket_blkno(xs->bucket), - free, need, max_free, le16_to_cpu(xh->xh_free_start), - le16_to_cpu(xh->xh_name_value_len)); - - if (free < need || - (xs->not_found && - count == ocfs2_xattr_max_xe_in_bucket(inode->i_sb))) { - if (need <= max_free && - count < ocfs2_xattr_max_xe_in_bucket(inode->i_sb)) { - /* - * We can create the space by defragment. Since only the - * name/value will be moved, the xe shouldn't be changed - * in xs. - */ - ret = ocfs2_defrag_xattr_bucket(inode, ctxt->handle, - xs->bucket); - if (ret) { - mlog_errno(ret); - goto out; - } - xh_free_start = le16_to_cpu(xh->xh_free_start); - free = xh_free_start - header_size - - OCFS2_XATTR_HEADER_GAP; - if (xh_free_start % blocksize < need) - free -= xh_free_start % blocksize; +out: + mlog_exit(ret); + return ret; +} - if (free >= need) - goto xattr_set; +static int ocfs2_xattr_set_entry_index_block(struct inode *inode, + struct ocfs2_xattr_info *xi, + struct ocfs2_xattr_search *xs, + struct ocfs2_xattr_set_ctxt *ctxt) +{ + int ret; - mlog(0, "Can't get enough space for xattr insert by " - "defragment. Need %u bytes, but we have %d, so " - "allocate new bucket for it.\n", need, free); - } + mlog_entry("Set xattr %s in xattr index block\n", xi->xi_name); - /* - * We have to add new buckets or clusters and one - * allocation should leave us enough space for insert. - */ - BUG_ON(allocation); + ret = ocfs2_xattr_set_entry_bucket(inode, xi, xs, ctxt); + if (!ret) + goto out; + if (ret != -ENOSPC) { + mlog_errno(ret); + goto out; + } - /* - * We do not allow for overlapping ranges between buckets. And - * the maximum number of collisions we will allow for then is - * one bucket's worth, so check it here whether we need to - * add a new bucket for the insert. - */ - ret = ocfs2_check_xattr_bucket_collision(inode, - xs->bucket, - xi->xi_name); - if (ret) { - mlog_errno(ret); - goto out; - } + /* Ack, need more space. Let's try to get another bucket! */ - ret = ocfs2_add_new_xattr_bucket(inode, - xs->xattr_bh, + /* + * We do not allow for overlapping ranges between buckets. And + * the maximum number of collisions we will allow for then is + * one bucket's worth, so check it here whether we need to + * add a new bucket for the insert. + */ + ret = ocfs2_check_xattr_bucket_collision(inode, xs->bucket, - ctxt); - if (ret) { - mlog_errno(ret); - goto out; - } + xi->xi_name); + if (ret) { + mlog_errno(ret); + goto out; + } - /* - * ocfs2_add_new_xattr_bucket() will have updated - * xs->bucket if it moved, but it will not have updated - * any of the other search fields. Thus, we drop it and - * re-search. Everything should be cached, so it'll be - * quick. - */ - ocfs2_xattr_bucket_relse(xs->bucket); - ret = ocfs2_xattr_index_block_find(inode, xs->xattr_bh, - xi->xi_name_index, - xi->xi_name, xs); - if (ret && ret != -ENODATA) - goto out; - xs->not_found = ret; - allocation = 1; - goto try_again; + ret = ocfs2_add_new_xattr_bucket(inode, + xs->xattr_bh, + xs->bucket, + ctxt); + if (ret) { + mlog_errno(ret); + goto out; } -xattr_set: - ret = ocfs2_xattr_set_in_bucket(inode, xi, xs, ctxt); + /* + * ocfs2_add_new_xattr_bucket() will have updated + * xs->bucket if it moved, but it will not have updated + * any of the other search fields. Thus, we drop it and + * re-search. Everything should be cached, so it'll be + * quick. + */ + ocfs2_xattr_bucket_relse(xs->bucket); + ret = ocfs2_xattr_index_block_find(inode, xs->xattr_bh, + xi->xi_name_index, + xi->xi_name, xs); + if (ret && ret != -ENODATA) + goto out; + xs->not_found = ret; + + /* Ok, we have a new bucket, let's try again */ + ret = ocfs2_xattr_set_entry_bucket(inode, xi, xs, ctxt); + if (ret && (ret != -ENOSPC)) + mlog_errno(ret); + out: mlog_exit(ret); return ret; |