[PATCH 08/39] ocfs2: Make high level btree extend code generic

Mark Fasheh
2008-09-24T22:02:19Z

From: Tao Ma <tao.ma@oracle.com>

Factor out the non-inode specifics of ocfs2_do_extend_allocation() into a more generic
function, ocfs2_do_cluster_allocation(). ocfs2_do_extend_allocation calls
ocfs2_do_cluster_allocation() now, but the latter can be used for other
btree types as well.

Signed-off-by: Tao Ma <tao.ma@oracle.com>
Signed-off-by: Mark Fasheh <mfasheh@suse.com>
---
fs/ocfs2/alloc.c | 110 +++++++++++++++++++++++++++++++++++++++++++
fs/ocfs2/alloc.h | 17 +++++++
fs/ocfs2/aops.c | 8 ++--
fs/ocfs2/dir.c | 6 +-
fs/ocfs2/file.c | 136 +++++++++++-------------------------------------------
fs/ocfs2/file.h | 26 ++++------
fs/ocfs2/namei.c | 8 ++--
7 files changed, 176 insertions(+), 135 deletions(-)

diff --git a/fs/ocfs2/alloc.c b/fs/ocfs2/alloc.c
index 90cefc5..1332309 100644
--- a/fs/ocfs2/alloc.c
+++ b/fs/ocfs2/alloc.c
@@ -4302,6 +4302,116 @@ bail:
return status;
}

+/*
+ * Allcate and add clusters into the extent b-tree.
+ * The new clusters(clusters_to_add) will be inserted at logical_offset.
+ * The extent b-tree's root is root_el and it should be in root_bh, and
+ * it is not limited to the file storage. Any extent tree can use this
+ * function if it implements the proper ocfs2_extent_tree.
+ */
+int ocfs2_add_clusters_in_btree(struct ocfs2_super *osb,
+ struct inode *inode,
+ u32 *logical_offset,
+ u32 clusters_to_add,
+ int mark_unwritten,
+ struct buffer_head *root_bh,
+ struct ocfs2_extent_list *root_el,
+ handle_t *handle,
+ struct ocfs2_alloc_context *data_ac,
+ struct ocfs2_alloc_context *meta_ac,
+ enum ocfs2_alloc_restarted *reason_ret,
+ enum ocfs2_extent_tree_type type)
+{
+ int status = 0;
+ int free_extents;
+ enum ocfs2_alloc_restarted reason = RESTART_NONE;
+ u32 bit_off, num_bits;
+ u64 block;
+ u8 flags = 0;
+
+ BUG_ON(!clusters_to_add);
+
+ if (mark_unwritten)
+ flags = OCFS2_EXT_UNWRITTEN;
+
+ free_extents = ocfs2_num_free_extents(osb, inode, root_bh, type);
+ if (free_extents < 0) {
+ status = free_extents;
+ mlog_errno(status);
+ goto leave;
+ }
+
+ /* there are two cases which could cause us to EAGAIN in the
+ * we-need-more-metadata case:
+ * 1) we haven't reserved *any*
+ * 2) we are so fragmented, we've needed to add metadata too
+ * many times. */
+ if (!free_extents && !meta_ac) {
+ mlog(0, "we haven't reserved any metadata!\n");
+ status = -EAGAIN;
+ reason = RESTART_META;
+ goto leave;
+ } else if ((!free_extents)
+ && (ocfs2_alloc_context_bits_left(meta_ac)
+ < ocfs2_extend_meta_needed(root_el))) {
+ mlog(0, "filesystem is really fragmented...\n");
+ status = -EAGAIN;
+ reason = RESTART_META;
+ goto leave;
+ }
+
+ status = __ocfs2_claim_clusters(osb, handle, data_ac, 1,
+ clusters_to_add, &bit_off, &num_bits);
+ if (status < 0) {
+ if (status != -ENOSPC)
+ mlog_errno(status);
+ goto leave;
+ }
+
+ BUG_ON(num_bits > clusters_to_add);
+
+ /* reserve our write early -- insert_extent may update the inode */
+ status = ocfs2_journal_access(handle, inode, root_bh,
+ OCFS2_JOURNAL_ACCESS_WRITE);
+ if (status < 0) {
+ mlog_errno(status);
+ goto leave;
+ }
+
+ block = ocfs2_clusters_to_blocks(osb->sb, bit_off);
+ mlog(0, "Allocating %u clusters at block %u for inode %llu\n",
+ num_bits, bit_off, (unsigned long long)OCFS2_I(inode)->ip_blkno);
+ status = ocfs2_insert_extent(osb, handle, inode, root_bh,
+ *logical_offset, block, num_bits,
+ flags, meta_ac, type);
+ if (status < 0) {
+ mlog_errno(status);
+ goto leave;
+ }
+
+ status = ocfs2_journal_dirty(handle, root_bh);
+ if (status < 0) {
+ mlog_errno(status);
+ goto leave;
+ }
+
+ clusters_to_add -= num_bits;
+ *logical_offset += num_bits;
+
+ if (clusters_to_add) {
+ mlog(0, "need to alloc once more, wanted = %u\n",
+ clusters_to_add);
+ status = -EAGAIN;
+ reason = RESTART_TRANS;
+ }
+
+leave:
+ mlog_exit(status);
+ if (reason_ret)
+ *reason_ret = reason;
+ return status;
+}
+
static void ocfs2_make_right_split_rec(struct super_block *sb,
struct ocfs2_extent_rec *split_rec,
u32 cpos,
diff --git a/fs/ocfs2/alloc.h b/fs/ocfs2/alloc.h
index 5a460a9..5d51232 100644
--- a/fs/ocfs2/alloc.h
+++ b/fs/ocfs2/alloc.h
@@ -41,6 +41,23 @@ int ocfs2_insert_extent(struct ocfs2_super *osb,
u8 flags,
struct ocfs2_alloc_context *meta_ac,
enum ocfs2_extent_tree_type et_type);
+enum ocfs2_alloc_restarted {
+ RESTART_NONE = 0,
+ RESTART_TRANS,
+ RESTART_META
+};
+int ocfs2_add_clusters_in_btree(struct ocfs2_super *osb,
+ struct inode *inode,
+ u32 *logical_offset,
+ u32 clusters_to_add,
+ int mark_unwritten,
+ struct buffer_head *root_bh,
+ struct ocfs2_extent_list *root_el,
+ handle_t *handle,
+ struct ocfs2_alloc_context *data_ac,
+ struct ocfs2_alloc_context *meta_ac,
+ enum ocfs2_alloc_restarted *reason_ret,
+ enum ocfs2_extent_tree_type type);
struct ocfs2_cached_dealloc_ctxt;
int ocfs2_mark_extent_written(struct inode *inode, struct buffer_head *root_bh,
handle_t *handle, u32 cpos, u32 len, u32 phys,
diff --git a/fs/ocfs2/aops.c b/fs/ocfs2/aops.c
index 44ea5eb..e7acd28 100644
--- a/fs/ocfs2/aops.c
+++ b/fs/ocfs2/aops.c
@@ -1255,10 +1255,10 @@ static int ocfs2_write_cluster(struct address_space *mapping,
* any additional semaphores or cluster locks.
*/
tmp_pos = cpos;
- ret = ocfs2_do_extend_allocation(OCFS2_SB(inode->i_sb), inode,
- &tmp_pos, 1, 0, wc->w_di_bh,
- wc->w_handle, data_ac,
- meta_ac, NULL);
+ ret = ocfs2_add_inode_data(OCFS2_SB(inode->i_sb), inode,
+ &tmp_pos, 1, 0, wc->w_di_bh,
+ wc->w_handle, data_ac,
+ meta_ac, NULL);
/*
* This shouldn't happen because we must have already
* calculated the correct meta data allocation required. The
diff --git a/fs/ocfs2/dir.c b/fs/ocfs2/dir.c
index ba0fb9e..d17c34b 100644
--- a/fs/ocfs2/dir.c
+++ b/fs/ocfs2/dir.c
@@ -1383,9 +1383,9 @@ static int ocfs2_do_extend_dir(struct super_block *sb,
if (extend) {
u32 offset = OCFS2_I(dir)->ip_clusters;

- status = ocfs2_do_extend_allocation(OCFS2_SB(sb), dir, &offset,
- 1, 0, parent_fe_bh, handle,
- data_ac, meta_ac, NULL);
+ status = ocfs2_add_inode_data(OCFS2_SB(sb), dir, &offset,
+ 1, 0, parent_fe_bh, handle,
+ data_ac, meta_ac, NULL);
BUG_ON(status == -EAGAIN);
if (status < 0) {
mlog_errno(status);
diff --git a/fs/ocfs2/file.c b/fs/ocfs2/file.c
index ea20e74..3a12103 100644
--- a/fs/ocfs2/file.c
+++ b/fs/ocfs2/file.c
@@ -488,7 +488,7 @@ bail:
}

/*
- * extend allocation only here.
+ * extend file allocation only here.
* we'll update all the disk stuff, and oip->alloc_size
*
* expect stuff to be locked, a transaction started and enough data /
@@ -497,107 +497,25 @@ bail:
* Will return -EAGAIN, and a reason if a restart is needed.
* If passed in, *reason will always be set, even in error.
*/
-int ocfs2_do_extend_allocation(struct ocfs2_super *osb,
- struct inode *inode,
- u32 *logical_offset,
- u32 clusters_to_add,
- int mark_unwritten,
- struct buffer_head *fe_bh,
- handle_t *handle,
- struct ocfs2_alloc_context *data_ac,
- struct ocfs2_alloc_context *meta_ac,
- enum ocfs2_alloc_restarted *reason_ret)
+int ocfs2_add_inode_data(struct ocfs2_super *osb,
+ struct inode *inode,
+ u32 *logical_offset,
+ u32 clusters_to_add,
+ int mark_unwritten,
+ struct buffer_head *fe_bh,
+ handle_t *handle,
+ struct ocfs2_alloc_context *data_ac,
+ struct ocfs2_alloc_context *meta_ac,
+ enum ocfs2_alloc_restarted *reason_ret)
{
- int status = 0;
- int free_extents;
struct ocfs2_dinode *fe = (struct ocfs2_dinode *) fe_bh->b_data;
- enum ocfs2_alloc_restarted reason = RESTART_NONE;
- u32 bit_off, num_bits;
- u64 block;
- u8 flags = 0;
-
- BUG_ON(!clusters_to_add);
-
- if (mark_unwritten)
- flags = OCFS2_EXT_UNWRITTEN;
-
- free_extents = ocfs2_num_free_extents(osb, inode, fe_bh,
- OCFS2_DINODE_EXTENT);
- if (free_extents < 0) {
- status = free_extents;
- mlog_errno(status);
- goto leave;
- }
-
- /* there are two cases which could cause us to EAGAIN in the
- * we-need-more-metadata case:
- * 1) we haven't reserved *any*
- * 2) we are so fragmented, we've needed to add metadata too
- * many times. */
- if (!free_extents && !meta_ac) {
- mlog(0, "we haven't reserved any metadata!\n");
- status = -EAGAIN;
- reason = RESTART_META;
- goto leave;
- } else if ((!free_extents)
- && (ocfs2_alloc_context_bits_left(meta_ac)
- < ocfs2_extend_meta_needed(&fe->id2.i_list))) {
- mlog(0, "filesystem is really fragmented...\n");
- status = -EAGAIN;
- reason = RESTART_META;
- goto leave;
- }
+ struct ocfs2_extent_list *el = &fe->id2.i_list;

- status = __ocfs2_claim_clusters(osb, handle, data_ac, 1,
- clusters_to_add, &bit_off, &num_bits);
- if (status < 0) {
- if (status != -ENOSPC)
- mlog_errno(status);
- goto leave;
- }
-
- BUG_ON(num_bits > clusters_to_add);
-
- /* reserve our write early -- insert_extent may update the inode */
- status = ocfs2_journal_access(handle, inode, fe_bh,
- OCFS2_JOURNAL_ACCESS_WRITE);
- if (status < 0) {
- mlog_errno(status);
- goto leave;
- }
-
- block = ocfs2_clusters_to_blocks(osb->sb, bit_off);
- mlog(0, "Allocating %u clusters at block %u for inode %llu\n",
- num_bits, bit_off, (unsigned long long)OCFS2_I(inode)->ip_blkno);
- status = ocfs2_insert_extent(osb, handle, inode, fe_bh,
- *logical_offset, block, num_bits,
- flags, meta_ac, OCFS2_DINODE_EXTENT);
- if (status < 0) {
- mlog_errno(status);
- goto leave;
- }
-
- status = ocfs2_journal_dirty(handle, fe_bh);
- if (status < 0) {
- mlog_errno(status);
- goto leave;
- }
-
- clusters_to_add -= num_bits;
- *logical_offset += num_bits;
-
- if (clusters_to_add) {
- mlog(0, "need to alloc once more, clusters = %u, wanted = "
- "%u\n", fe->i_clusters, clusters_to_add);
- status = -EAGAIN;
- reason = RESTART_TRANS;
- }
-
-leave:
- mlog_exit(status);
- if (reason_ret)
- *reason_ret = reason;
- return status;
+ return ocfs2_add_clusters_in_btree(osb, inode, logical_offset,
+ clusters_to_add, mark_unwritten,
+ fe_bh, el, handle,
+ data_ac, meta_ac, reason_ret,
+ OCFS2_DINODE_EXTENT);
}

static int __ocfs2_extend_allocation(struct inode *inode, u32 logical_start,
@@ -676,16 +594,16 @@ restarted_transaction:

prev_clusters = OCFS2_I(inode)->ip_clusters;

- status = ocfs2_do_extend_allocation(osb,
- inode,
- &logical_start,
- clusters_to_add,
- mark_unwritten,
- bh,
- handle,
- data_ac,
- meta_ac,
- &why);
+ status = ocfs2_add_inode_data(osb,
+ inode,
+ &logical_start,
+ clusters_to_add,
+ mark_unwritten,
+ bh,
+ handle,
+ data_ac,
+ meta_ac,
+ &why);
if ((status < 0) && (status != -EAGAIN)) {
if (status != -ENOSPC)
mlog_errno(status);
diff --git a/fs/ocfs2/file.h b/fs/ocfs2/file.h
index 18e5c80..e92382c 100644
--- a/fs/ocfs2/file.h
+++ b/fs/ocfs2/file.h
@@ -33,6 +33,7 @@ extern const struct file_operations ocfs2_dops_no_plocks;
extern const struct inode_operations ocfs2_file_iops;
extern const struct inode_operations ocfs2_special_file_iops;
struct ocfs2_alloc_context;
+enum ocfs2_alloc_restarted;

struct ocfs2_file_private {
struct file *fp_file;
@@ -40,21 +41,16 @@ struct ocfs2_file_private {
struct ocfs2_lock_res fp_flock;
};

-enum ocfs2_alloc_restarted {
- RESTART_NONE = 0,
- RESTART_TRANS,
- RESTART_META
-};
-int ocfs2_do_extend_allocation(struct ocfs2_super *osb,
- struct inode *inode,
- u32 *logical_offset,
- u32 clusters_to_add,
- int mark_unwritten,
- struct buffer_head *fe_bh,
- handle_t *handle,
- struct ocfs2_alloc_context *data_ac,
- struct ocfs2_alloc_context *meta_ac,
- enum ocfs2_alloc_restarted *reason_ret);
+int ocfs2_add_inode_data(struct ocfs2_super *osb,
+ struct inode *inode,
+ u32 *logical_offset,
+ u32 clusters_to_add,
+ int mark_unwritten,
+ struct buffer_head *fe_bh,
+ handle_t *handle,
+ struct ocfs2_alloc_context *data_ac,
+ struct ocfs2_alloc_context *meta_ac,
+ enum ocfs2_alloc_restarted *reason_ret);
int ocfs2_extend_no_holes(struct inode *inode, u64 new_i_size,
u64 zero_to);
int ocfs2_setattr(struct dentry *dentry, struct iattr *attr);
diff --git a/fs/ocfs2/namei.c b/fs/ocfs2/namei.c
index d5d808f..2cd6f50 100644
--- a/fs/ocfs2/namei.c
+++ b/fs/ocfs2/namei.c
@@ -1598,10 +1598,10 @@ static int ocfs2_symlink(struct inode *dir,
u32 offset = 0;

inode->i_op = &ocfs2_symlink_inode_operations;
- status = ocfs2_do_extend_allocation(osb, inode, &offset, 1, 0,
- new_fe_bh,
- handle, data_ac, NULL,
- NULL);
+ status = ocfs2_add_inode_data(osb, inode, &offset, 1, 0,
+ new_fe_bh,
+ handle, data_ac, NULL,
+ NULL);
if (status < 0) {
if (status != -ENOSPC && status != -EINTR) {
mlog(ML_ERROR,
--
1.5.4.5