diff options
author | Joel Becker <joel.becker@oracle.com> | 2008-08-20 19:36:33 -0700 |
---|---|---|
committer | Mark Fasheh <mfasheh@suse.com> | 2008-10-13 16:57:05 -0700 |
commit | f99b9b7ccf6a691f653cec45f36bfdd1e94769c7 (patch) | |
tree | 1c6ff6ea1fa1bb86b70f1fd78dd725b559c729e4 /fs/ocfs2/alloc.c | |
parent | 1e61ee79e2a96f62c007486677319814ce621c3c (diff) | |
download | lwn-f99b9b7ccf6a691f653cec45f36bfdd1e94769c7.tar.gz lwn-f99b9b7ccf6a691f653cec45f36bfdd1e94769c7.zip |
ocfs2: Make ocfs2_extent_tree the first-class representation of a tree.
We now have three different kinds of extent trees in ocfs2: inode data
(dinode), extended attributes (xattr_tree), and extended attribute
values (xattr_value). There is a nice abstraction for them,
ocfs2_extent_tree, but it is hidden in alloc.c. All the calling
functions have to pick amongst a varied API and pass in type bits and
often extraneous pointers.
A better way is to make ocfs2_extent_tree a first-class object.
Everyone converts their object to an ocfs2_extent_tree() via the
ocfs2_get_*_extent_tree() calls, then uses the ocfs2_extent_tree for all
tree calls to alloc.c.
This simplifies a lot of callers, making for readability. It also
provides an easy way to add additional extent tree types, as they only
need to be defined in alloc.c with a ocfs2_get_<new>_extent_tree()
function.
Signed-off-by: Joel Becker <joel.becker@oracle.com>
Signed-off-by: Mark Fasheh <mfasheh@suse.com>
Diffstat (limited to 'fs/ocfs2/alloc.c')
-rw-r--r-- | fs/ocfs2/alloc.c | 300 |
1 files changed, 90 insertions, 210 deletions
diff --git a/fs/ocfs2/alloc.c b/fs/ocfs2/alloc.c index ce54730e18ff..786a82982622 100644 --- a/fs/ocfs2/alloc.c +++ b/fs/ocfs2/alloc.c @@ -49,20 +49,6 @@ #include "buffer_head_io.h" -/* - * ocfs2_extent_tree and ocfs2_extent_tree_operations are used to abstract - * the b-tree operations in ocfs2. Now all the b-tree operations are not - * limited to ocfs2_dinode only. Any data which need to allocate clusters - * to store can use b-tree. And it only needs to implement its ocfs2_extent_tree - * and operation. - * - * ocfs2_extent_tree contains info for the root of the b-tree, it must have a - * root ocfs2_extent_list and a root_bh so that they can be used in the b-tree - * functions. - * ocfs2_extent_tree_operations abstract the normal operations we do for - * the root of extent b-tree. - */ -struct ocfs2_extent_tree; struct ocfs2_extent_tree_operations { void (*eo_set_last_eb_blk)(struct ocfs2_extent_tree *et, @@ -83,28 +69,38 @@ struct ocfs2_extent_tree_operations { struct ocfs2_extent_tree *et); }; -struct ocfs2_extent_tree { - enum ocfs2_extent_tree_type et_type; - struct ocfs2_extent_tree_operations *et_ops; - struct buffer_head *et_root_bh; - struct ocfs2_extent_list *et_root_el; - void *et_object; - unsigned int et_max_leaf_clusters; -}; -static void ocfs2_dinode_fill_root_el(struct ocfs2_extent_tree *et) -{ - struct ocfs2_dinode *di = et->et_object; - - et->et_root_el = &di->id2.i_list; -} +/* + * Pre-declare ocfs2_dinode_et_ops so we can use it as a sanity check + * in the methods. + */ +static u64 ocfs2_dinode_get_last_eb_blk(struct ocfs2_extent_tree *et); +static void ocfs2_dinode_set_last_eb_blk(struct ocfs2_extent_tree *et, + u64 blkno); +static void ocfs2_dinode_update_clusters(struct inode *inode, + struct ocfs2_extent_tree *et, + u32 clusters); +static int ocfs2_dinode_insert_check(struct inode *inode, + struct ocfs2_extent_tree *et, + struct ocfs2_extent_rec *rec); +static int ocfs2_dinode_sanity_check(struct inode *inode, + struct ocfs2_extent_tree *et); +static void ocfs2_dinode_fill_root_el(struct ocfs2_extent_tree *et); +static struct ocfs2_extent_tree_operations ocfs2_dinode_et_ops = { + .eo_set_last_eb_blk = ocfs2_dinode_set_last_eb_blk, + .eo_get_last_eb_blk = ocfs2_dinode_get_last_eb_blk, + .eo_update_clusters = ocfs2_dinode_update_clusters, + .eo_insert_check = ocfs2_dinode_insert_check, + .eo_sanity_check = ocfs2_dinode_sanity_check, + .eo_fill_root_el = ocfs2_dinode_fill_root_el, +}; static void ocfs2_dinode_set_last_eb_blk(struct ocfs2_extent_tree *et, u64 blkno) { struct ocfs2_dinode *di = et->et_object; - BUG_ON(et->et_type != OCFS2_DINODE_EXTENT); + BUG_ON(et->et_ops != &ocfs2_dinode_et_ops); di->i_last_eb_blk = cpu_to_le64(blkno); } @@ -112,7 +108,7 @@ static u64 ocfs2_dinode_get_last_eb_blk(struct ocfs2_extent_tree *et) { struct ocfs2_dinode *di = et->et_object; - BUG_ON(et->et_type != OCFS2_DINODE_EXTENT); + BUG_ON(et->et_ops != &ocfs2_dinode_et_ops); return le64_to_cpu(di->i_last_eb_blk); } @@ -153,7 +149,7 @@ static int ocfs2_dinode_sanity_check(struct inode *inode, int ret = 0; struct ocfs2_dinode *di; - BUG_ON(et->et_type != OCFS2_DINODE_EXTENT); + BUG_ON(et->et_ops != &ocfs2_dinode_et_ops); di = et->et_object; if (!OCFS2_IS_VALID_DINODE(di)) { @@ -166,14 +162,13 @@ static int ocfs2_dinode_sanity_check(struct inode *inode, return ret; } -static struct ocfs2_extent_tree_operations ocfs2_dinode_et_ops = { - .eo_set_last_eb_blk = ocfs2_dinode_set_last_eb_blk, - .eo_get_last_eb_blk = ocfs2_dinode_get_last_eb_blk, - .eo_update_clusters = ocfs2_dinode_update_clusters, - .eo_insert_check = ocfs2_dinode_insert_check, - .eo_sanity_check = ocfs2_dinode_sanity_check, - .eo_fill_root_el = ocfs2_dinode_fill_root_el, -}; +static void ocfs2_dinode_fill_root_el(struct ocfs2_extent_tree *et) +{ + struct ocfs2_dinode *di = et->et_object; + + et->et_root_el = &di->id2.i_list; +} + static void ocfs2_xattr_value_fill_root_el(struct ocfs2_extent_tree *et) { @@ -269,10 +264,8 @@ static void __ocfs2_get_extent_tree(struct ocfs2_extent_tree *et, struct inode *inode, struct buffer_head *bh, void *obj, - enum ocfs2_extent_tree_type et_type, struct ocfs2_extent_tree_operations *ops) { - et->et_type = et_type; et->et_ops = ops; get_bh(bh); et->et_root_bh = bh; @@ -287,50 +280,31 @@ static void __ocfs2_get_extent_tree(struct ocfs2_extent_tree *et, et->et_ops->eo_fill_max_leaf_clusters(inode, et); } -static void ocfs2_get_dinode_extent_tree(struct ocfs2_extent_tree *et, - struct inode *inode, - struct buffer_head *bh) +void ocfs2_get_dinode_extent_tree(struct ocfs2_extent_tree *et, + struct inode *inode, + struct buffer_head *bh) { - __ocfs2_get_extent_tree(et, inode, bh, NULL, OCFS2_DINODE_EXTENT, - &ocfs2_dinode_et_ops); + __ocfs2_get_extent_tree(et, inode, bh, NULL, &ocfs2_dinode_et_ops); } -static void ocfs2_get_xattr_tree_extent_tree(struct ocfs2_extent_tree *et, - struct inode *inode, - struct buffer_head *bh) +void ocfs2_get_xattr_tree_extent_tree(struct ocfs2_extent_tree *et, + struct inode *inode, + struct buffer_head *bh) { __ocfs2_get_extent_tree(et, inode, bh, NULL, - OCFS2_XATTR_TREE_EXTENT, &ocfs2_xattr_tree_et_ops); } -static void ocfs2_get_xattr_value_extent_tree(struct ocfs2_extent_tree *et, - struct inode *inode, - struct buffer_head *bh, - struct ocfs2_xattr_value_root *xv) +void ocfs2_get_xattr_value_extent_tree(struct ocfs2_extent_tree *et, + struct inode *inode, + struct buffer_head *bh, + struct ocfs2_xattr_value_root *xv) { __ocfs2_get_extent_tree(et, inode, bh, xv, - OCFS2_XATTR_VALUE_EXTENT, &ocfs2_xattr_value_et_ops); } -static void ocfs2_get_extent_tree(struct ocfs2_extent_tree *et, - struct inode *inode, - struct buffer_head *bh, - enum ocfs2_extent_tree_type et_type, - void *obj) -{ - if (et_type == OCFS2_DINODE_EXTENT) - ocfs2_get_dinode_extent_tree(et, inode, bh); - else if (et_type == OCFS2_XATTR_VALUE_EXTENT) - ocfs2_get_xattr_tree_extent_tree(et, inode, bh); - else if (et_type == OCFS2_XATTR_TREE_EXTENT) - ocfs2_get_xattr_value_extent_tree(et, inode, bh, obj); - else - BUG(); -} - -static void ocfs2_put_extent_tree(struct ocfs2_extent_tree *et) +void ocfs2_put_extent_tree(struct ocfs2_extent_tree *et) { brelse(et->et_root_bh); } @@ -682,22 +656,18 @@ struct ocfs2_merge_ctxt { */ int ocfs2_num_free_extents(struct ocfs2_super *osb, struct inode *inode, - struct buffer_head *root_bh, - enum ocfs2_extent_tree_type type, - void *obj) + struct ocfs2_extent_tree *et) { int retval; struct ocfs2_extent_list *el = NULL; struct ocfs2_extent_block *eb; struct buffer_head *eb_bh = NULL; u64 last_eb_blk = 0; - struct ocfs2_extent_tree et; mlog_entry_void(); - ocfs2_get_extent_tree(&et, inode, root_bh, type, obj); - el = et.et_root_el; - last_eb_blk = ocfs2_et_get_last_eb_blk(&et); + el = et->et_root_el; + last_eb_blk = ocfs2_et_get_last_eb_blk(et); if (last_eb_blk) { retval = ocfs2_read_block(osb, last_eb_blk, @@ -717,7 +687,6 @@ bail: if (eb_bh) brelse(eb_bh); - ocfs2_put_extent_tree(&et); mlog_exit(retval); return retval; } @@ -4406,16 +4375,15 @@ out: * * The caller needs to update fe->i_clusters */ -static int ocfs2_insert_extent(struct ocfs2_super *osb, - handle_t *handle, - struct inode *inode, - struct buffer_head *root_bh, - u32 cpos, - u64 start_blk, - u32 new_clusters, - u8 flags, - struct ocfs2_alloc_context *meta_ac, - struct ocfs2_extent_tree *et) +int ocfs2_insert_extent(struct ocfs2_super *osb, + handle_t *handle, + struct inode *inode, + struct ocfs2_extent_tree *et, + u32 cpos, + u64 start_blk, + u32 new_clusters, + u8 flags, + struct ocfs2_alloc_context *meta_ac) { int status; int uninitialized_var(free_records); @@ -4464,7 +4432,7 @@ static int ocfs2_insert_extent(struct ocfs2_super *osb, status = ocfs2_do_insert_extent(inode, handle, et, &rec, &insert); if (status < 0) mlog_errno(status); - else if (et->et_type == OCFS2_DINODE_EXTENT) + else if (et->et_ops == &ocfs2_dinode_et_ops) ocfs2_extent_map_insert_rec(inode, &rec); bail: @@ -4475,77 +4443,10 @@ bail: return status; } -int ocfs2_dinode_insert_extent(struct ocfs2_super *osb, - handle_t *handle, - struct inode *inode, - struct buffer_head *root_bh, - u32 cpos, - u64 start_blk, - u32 new_clusters, - u8 flags, - struct ocfs2_alloc_context *meta_ac) -{ - int status; - struct ocfs2_extent_tree et; - - ocfs2_get_dinode_extent_tree(&et, inode, root_bh); - status = ocfs2_insert_extent(osb, handle, inode, root_bh, - cpos, start_blk, new_clusters, - flags, meta_ac, &et); - ocfs2_put_extent_tree(&et); - - return status; -} - -int ocfs2_xattr_value_insert_extent(struct ocfs2_super *osb, - handle_t *handle, - struct inode *inode, - struct buffer_head *root_bh, - u32 cpos, - u64 start_blk, - u32 new_clusters, - u8 flags, - struct ocfs2_alloc_context *meta_ac, - struct ocfs2_xattr_value_root *xv) -{ - int status; - struct ocfs2_extent_tree et; - - ocfs2_get_xattr_value_extent_tree(&et, inode, root_bh, xv); - status = ocfs2_insert_extent(osb, handle, inode, root_bh, - cpos, start_blk, new_clusters, - flags, meta_ac, &et); - ocfs2_put_extent_tree(&et); - - return status; -} - -int ocfs2_xattr_tree_insert_extent(struct ocfs2_super *osb, - handle_t *handle, - struct inode *inode, - struct buffer_head *root_bh, - u32 cpos, - u64 start_blk, - u32 new_clusters, - u8 flags, - struct ocfs2_alloc_context *meta_ac) -{ - int status; - struct ocfs2_extent_tree et; - - ocfs2_get_xattr_tree_extent_tree(&et, inode, root_bh); - status = ocfs2_insert_extent(osb, handle, inode, root_bh, - cpos, start_blk, new_clusters, - flags, meta_ac, &et); - ocfs2_put_extent_tree(&et); - - 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 + * The extent b-tree's root is specified by et, and * it is not limited to the file storage. Any extent tree can use this * function if it implements the proper ocfs2_extent_tree. */ @@ -4554,14 +4455,11 @@ int ocfs2_add_clusters_in_btree(struct ocfs2_super *osb, u32 *logical_offset, u32 clusters_to_add, int mark_unwritten, - struct buffer_head *root_bh, - struct ocfs2_extent_list *root_el, + struct ocfs2_extent_tree *et, 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, - void *obj) + enum ocfs2_alloc_restarted *reason_ret) { int status = 0; int free_extents; @@ -4575,8 +4473,7 @@ int ocfs2_add_clusters_in_btree(struct ocfs2_super *osb, if (mark_unwritten) flags = OCFS2_EXT_UNWRITTEN; - free_extents = ocfs2_num_free_extents(osb, inode, root_bh, type, - obj); + free_extents = ocfs2_num_free_extents(osb, inode, et); if (free_extents < 0) { status = free_extents; mlog_errno(status); @@ -4595,7 +4492,7 @@ int ocfs2_add_clusters_in_btree(struct ocfs2_super *osb, goto leave; } else if ((!free_extents) && (ocfs2_alloc_context_bits_left(meta_ac) - < ocfs2_extend_meta_needed(root_el))) { + < ocfs2_extend_meta_needed(et->et_root_el))) { mlog(0, "filesystem is really fragmented...\n"); status = -EAGAIN; reason = RESTART_META; @@ -4613,7 +4510,7 @@ int ocfs2_add_clusters_in_btree(struct ocfs2_super *osb, 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, + status = ocfs2_journal_access(handle, inode, et->et_root_bh, OCFS2_JOURNAL_ACCESS_WRITE); if (status < 0) { mlog_errno(status); @@ -4623,28 +4520,15 @@ int ocfs2_add_clusters_in_btree(struct ocfs2_super *osb, 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); - if (type == OCFS2_DINODE_EXTENT) - status = ocfs2_dinode_insert_extent(osb, handle, inode, root_bh, - *logical_offset, block, - num_bits, flags, meta_ac); - else if (type == OCFS2_XATTR_TREE_EXTENT) - status = ocfs2_xattr_tree_insert_extent(osb, handle, - inode, root_bh, - *logical_offset, - block, num_bits, flags, - meta_ac); - else - status = ocfs2_xattr_value_insert_extent(osb, handle, - inode, root_bh, - *logical_offset, - block, num_bits, flags, - meta_ac, obj); + status = ocfs2_insert_extent(osb, handle, inode, et, + *logical_offset, block, + num_bits, flags, meta_ac); if (status < 0) { mlog_errno(status); goto leave; } - status = ocfs2_journal_dirty(handle, root_bh); + status = ocfs2_journal_dirty(handle, et->et_root_bh); if (status < 0) { mlog_errno(status); goto leave; @@ -4915,25 +4799,21 @@ out: * * The caller is responsible for passing down meta_ac if we'll need it. */ -int ocfs2_mark_extent_written(struct inode *inode, struct buffer_head *root_bh, +int ocfs2_mark_extent_written(struct inode *inode, + struct ocfs2_extent_tree *et, handle_t *handle, u32 cpos, u32 len, u32 phys, struct ocfs2_alloc_context *meta_ac, - struct ocfs2_cached_dealloc_ctxt *dealloc, - enum ocfs2_extent_tree_type et_type, - void *obj) + struct ocfs2_cached_dealloc_ctxt *dealloc) { int ret, index; u64 start_blkno = ocfs2_clusters_to_blocks(inode->i_sb, phys); struct ocfs2_extent_rec split_rec; struct ocfs2_path *left_path = NULL; struct ocfs2_extent_list *el; - struct ocfs2_extent_tree et; mlog(0, "Inode %lu cpos %u, len %u, phys %u (%llu)\n", inode->i_ino, cpos, len, phys, (unsigned long long)start_blkno); - ocfs2_get_extent_tree(&et, inode, root_bh, et_type, obj); - if (!ocfs2_writes_unwritten_extents(OCFS2_SB(inode->i_sb))) { ocfs2_error(inode->i_sb, "Inode %llu has unwritten extents " "that are being written to, but the feature bit " @@ -4946,11 +4826,14 @@ int ocfs2_mark_extent_written(struct inode *inode, struct buffer_head *root_bh, /* * XXX: This should be fixed up so that we just re-insert the * next extent records. + * + * XXX: This is a hack on the extent tree, maybe it should be + * an op? */ - if (et_type == OCFS2_DINODE_EXTENT) + if (et->et_ops == &ocfs2_dinode_et_ops) ocfs2_extent_map_trunc(inode, 0); - left_path = ocfs2_new_path(et.et_root_bh, et.et_root_el); + left_path = ocfs2_new_path(et->et_root_bh, et->et_root_el); if (!left_path) { ret = -ENOMEM; mlog_errno(ret); @@ -4981,7 +4864,7 @@ int ocfs2_mark_extent_written(struct inode *inode, struct buffer_head *root_bh, split_rec.e_flags = path_leaf_el(left_path)->l_recs[index].e_flags; split_rec.e_flags &= ~OCFS2_EXT_UNWRITTEN; - ret = __ocfs2_mark_extent_written(inode, &et, handle, left_path, + ret = __ocfs2_mark_extent_written(inode, et, handle, left_path, index, &split_rec, meta_ac, dealloc); if (ret) @@ -4989,7 +4872,6 @@ int ocfs2_mark_extent_written(struct inode *inode, struct buffer_head *root_bh, out: ocfs2_free_path(left_path); - ocfs2_put_extent_tree(&et); return ret; } @@ -5219,25 +5101,21 @@ out: return ret; } -int ocfs2_remove_extent(struct inode *inode, struct buffer_head *root_bh, +int ocfs2_remove_extent(struct inode *inode, + struct ocfs2_extent_tree *et, u32 cpos, u32 len, handle_t *handle, struct ocfs2_alloc_context *meta_ac, - struct ocfs2_cached_dealloc_ctxt *dealloc, - enum ocfs2_extent_tree_type et_type, - void *obj) + struct ocfs2_cached_dealloc_ctxt *dealloc) { int ret, index; u32 rec_range, trunc_range; struct ocfs2_extent_rec *rec; struct ocfs2_extent_list *el; struct ocfs2_path *path = NULL; - struct ocfs2_extent_tree et; - - ocfs2_get_extent_tree(&et, inode, root_bh, et_type, obj); ocfs2_extent_map_trunc(inode, 0); - path = ocfs2_new_path(et.et_root_bh, et.et_root_el); + path = ocfs2_new_path(et->et_root_bh, et->et_root_el); if (!path) { ret = -ENOMEM; mlog_errno(ret); @@ -5290,13 +5168,13 @@ int ocfs2_remove_extent(struct inode *inode, struct buffer_head *root_bh, if (le32_to_cpu(rec->e_cpos) == cpos || rec_range == trunc_range) { ret = ocfs2_truncate_rec(inode, handle, path, index, dealloc, - cpos, len, &et); + cpos, len, et); if (ret) { mlog_errno(ret); goto out; } } else { - ret = ocfs2_split_tree(inode, &et, handle, path, index, + ret = ocfs2_split_tree(inode, et, handle, path, index, trunc_range, meta_ac); if (ret) { mlog_errno(ret); @@ -5345,7 +5223,7 @@ int ocfs2_remove_extent(struct inode *inode, struct buffer_head *root_bh, } ret = ocfs2_truncate_rec(inode, handle, path, index, dealloc, - cpos, len, &et); + cpos, len, et); if (ret) { mlog_errno(ret); goto out; @@ -5354,7 +5232,6 @@ int ocfs2_remove_extent(struct inode *inode, struct buffer_head *root_bh, out: ocfs2_free_path(path); - ocfs2_put_extent_tree(&et); return ret; } @@ -6773,6 +6650,7 @@ int ocfs2_convert_inline_data_to_extents(struct inode *inode, struct ocfs2_alloc_context *data_ac = NULL; struct page **pages = NULL; loff_t end = osb->s_clustersize; + struct ocfs2_extent_tree et; has_data = i_size_read(inode) ? 1 : 0; @@ -6872,8 +6750,10 @@ int ocfs2_convert_inline_data_to_extents(struct inode *inode, * this proves to be false, we could always re-build * the in-inode data from our pages. */ - ret = ocfs2_dinode_insert_extent(osb, handle, inode, di_bh, - 0, block, 1, 0, NULL); + ocfs2_get_dinode_extent_tree(&et, inode, di_bh); + ret = ocfs2_insert_extent(osb, handle, inode, &et, + 0, block, 1, 0, NULL); + ocfs2_put_extent_tree(&et); if (ret) { mlog_errno(ret); goto out_commit; |