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ext2, ext4: make mb block cache names more explicit

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There will be a second mb_cache instance that tracks ea_inodes. Make
existing names more explicit so that it is clear that they refer to
xattr block cache.

Signed-off-by: Tahsin Erdogan <tahsin@google.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
This commit is contained in:
Tahsin Erdogan
2017-06-22 11:28:55 -04:00
committed by Theodore Ts'o
parent c07dfcb458
commit 47387409ee
6 changed files with 75 additions and 70 deletions
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2
fs/ext2/ext2.h
View File

@@ -113,7 +113,7 @@ struct ext2_sb_info {
* of the mount options.
*/
spinlock_t s_lock;
struct mb_cache *s_mb_cache;
struct mb_cache *s_ea_block_cache;
};
static inline spinlock_t *

16
fs/ext2/super.c
View File

@@ -147,9 +147,9 @@ static void ext2_put_super (struct super_block * sb)
ext2_quota_off_umount(sb);
if (sbi->s_mb_cache) {
ext2_xattr_destroy_cache(sbi->s_mb_cache);
sbi->s_mb_cache = NULL;
if (sbi->s_ea_block_cache) {
ext2_xattr_destroy_cache(sbi->s_ea_block_cache);
sbi->s_ea_block_cache = NULL;
}
if (!(sb->s_flags & MS_RDONLY)) {
struct ext2_super_block *es = sbi->s_es;
@@ -1131,9 +1131,9 @@ static int ext2_fill_super(struct super_block *sb, void *data, int silent)
}
#ifdef CONFIG_EXT2_FS_XATTR
sbi->s_mb_cache = ext2_xattr_create_cache();
if (!sbi->s_mb_cache) {
ext2_msg(sb, KERN_ERR, "Failed to create an mb_cache");
sbi->s_ea_block_cache = ext2_xattr_create_cache();
if (!sbi->s_ea_block_cache) {
ext2_msg(sb, KERN_ERR, "Failed to create ea_block_cache");
goto failed_mount3;
}
#endif
@@ -1182,8 +1182,8 @@ cantfind_ext2:
sb->s_id);
goto failed_mount;
failed_mount3:
if (sbi->s_mb_cache)
ext2_xattr_destroy_cache(sbi->s_mb_cache);
if (sbi->s_ea_block_cache)
ext2_xattr_destroy_cache(sbi->s_ea_block_cache);
percpu_counter_destroy(&sbi->s_freeblocks_counter);
percpu_counter_destroy(&sbi->s_freeinodes_counter);
percpu_counter_destroy(&sbi->s_dirs_counter);

36
fs/ext2/xattr.c
View File

@@ -121,6 +121,8 @@ const struct xattr_handler *ext2_xattr_handlers[] = {
NULL
};
#define EA_BLOCK_CACHE(inode) (EXT2_SB(inode->i_sb)->s_ea_block_cache)
static inline const struct xattr_handler *
ext2_xattr_handler(int name_index)
{
@@ -150,7 +152,7 @@ ext2_xattr_get(struct inode *inode, int name_index, const char *name,
size_t name_len, size;
char *end;
int error;
struct mb_cache *ext2_mb_cache = EXT2_SB(inode->i_sb)->s_mb_cache;
struct mb_cache *ea_block_cache = EA_BLOCK_CACHE(inode);
ea_idebug(inode, "name=%d.%s, buffer=%p, buffer_size=%ld",
name_index, name, buffer, (long)buffer_size);
@@ -195,7 +197,7 @@ bad_block: ext2_error(inode->i_sb, "ext2_xattr_get",
goto found;
entry = next;
}
if (ext2_xattr_cache_insert(ext2_mb_cache, bh))
if (ext2_xattr_cache_insert(ea_block_cache, bh))
ea_idebug(inode, "cache insert failed");
error = -ENODATA;
goto cleanup;
@@ -208,7 +210,7 @@ found:
le16_to_cpu(entry->e_value_offs) + size > inode->i_sb->s_blocksize)
goto bad_block;
if (ext2_xattr_cache_insert(ext2_mb_cache, bh))
if (ext2_xattr_cache_insert(ea_block_cache, bh))
ea_idebug(inode, "cache insert failed");
if (buffer) {
error = -ERANGE;
@@ -246,7 +248,7 @@ ext2_xattr_list(struct dentry *dentry, char *buffer, size_t buffer_size)
char *end;
size_t rest = buffer_size;
int error;
struct mb_cache *ext2_mb_cache = EXT2_SB(inode->i_sb)->s_mb_cache;
struct mb_cache *ea_block_cache = EA_BLOCK_CACHE(inode);
ea_idebug(inode, "buffer=%p, buffer_size=%ld",
buffer, (long)buffer_size);
@@ -281,7 +283,7 @@ bad_block: ext2_error(inode->i_sb, "ext2_xattr_list",
goto bad_block;
entry = next;
}
if (ext2_xattr_cache_insert(ext2_mb_cache, bh))
if (ext2_xattr_cache_insert(ea_block_cache, bh))
ea_idebug(inode, "cache insert failed");
/* list the attribute names */
@@ -493,7 +495,7 @@ bad_block: ext2_error(sb, "ext2_xattr_set",
* This must happen under buffer lock for
* ext2_xattr_set2() to reliably detect modified block
*/
mb_cache_entry_delete(EXT2_SB(sb)->s_mb_cache, hash,
mb_cache_entry_delete(EA_BLOCK_CACHE(inode), hash,
bh->b_blocknr);
/* keep the buffer locked while modifying it. */
@@ -627,7 +629,7 @@ ext2_xattr_set2(struct inode *inode, struct buffer_head *old_bh,
struct super_block *sb = inode->i_sb;
struct buffer_head *new_bh = NULL;
int error;
struct mb_cache *ext2_mb_cache = EXT2_SB(sb)->s_mb_cache;
struct mb_cache *ea_block_cache = EA_BLOCK_CACHE(inode);
if (header) {
new_bh = ext2_xattr_cache_find(inode, header);
@@ -655,7 +657,7 @@ ext2_xattr_set2(struct inode *inode, struct buffer_head *old_bh,
don't need to change the reference count. */
new_bh = old_bh;
get_bh(new_bh);
ext2_xattr_cache_insert(ext2_mb_cache, new_bh);
ext2_xattr_cache_insert(ea_block_cache, new_bh);
} else {
/* We need to allocate a new block */
ext2_fsblk_t goal = ext2_group_first_block_no(sb,
@@ -676,7 +678,7 @@ ext2_xattr_set2(struct inode *inode, struct buffer_head *old_bh,
memcpy(new_bh->b_data, header, new_bh->b_size);
set_buffer_uptodate(new_bh);
unlock_buffer(new_bh);
ext2_xattr_cache_insert(ext2_mb_cache, new_bh);
ext2_xattr_cache_insert(ea_block_cache, new_bh);
ext2_xattr_update_super_block(sb);
}
@@ -721,7 +723,7 @@ ext2_xattr_set2(struct inode *inode, struct buffer_head *old_bh,
* This must happen under buffer lock for
* ext2_xattr_set2() to reliably detect freed block
*/
mb_cache_entry_delete(ext2_mb_cache, hash,
mb_cache_entry_delete(ea_block_cache, hash,
old_bh->b_blocknr);
/* Free the old block. */
ea_bdebug(old_bh, "freeing");
@@ -795,7 +797,7 @@ ext2_xattr_delete_inode(struct inode *inode)
* This must happen under buffer lock for ext2_xattr_set2() to
* reliably detect freed block
*/
mb_cache_entry_delete(EXT2_SB(inode->i_sb)->s_mb_cache, hash,
mb_cache_entry_delete(EA_BLOCK_CACHE(inode), hash,
bh->b_blocknr);
ext2_free_blocks(inode, EXT2_I(inode)->i_file_acl, 1);
get_bh(bh);
@@ -897,13 +899,13 @@ ext2_xattr_cache_find(struct inode *inode, struct ext2_xattr_header *header)
{
__u32 hash = le32_to_cpu(header->h_hash);
struct mb_cache_entry *ce;
struct mb_cache *ext2_mb_cache = EXT2_SB(inode->i_sb)->s_mb_cache;
struct mb_cache *ea_block_cache = EA_BLOCK_CACHE(inode);
if (!header->h_hash)
return NULL; /* never share */
ea_idebug(inode, "looking for cached blocks [%x]", (int)hash);
again:
ce = mb_cache_entry_find_first(ext2_mb_cache, hash);
ce = mb_cache_entry_find_first(ea_block_cache, hash);
while (ce) {
struct buffer_head *bh;
@@ -924,7 +926,7 @@ again:
* entry is still hashed is reliable.
*/
if (hlist_bl_unhashed(&ce->e_hash_list)) {
mb_cache_entry_put(ext2_mb_cache, ce);
mb_cache_entry_put(ea_block_cache, ce);
unlock_buffer(bh);
brelse(bh);
goto again;
@@ -937,14 +939,14 @@ again:
} else if (!ext2_xattr_cmp(header, HDR(bh))) {
ea_bdebug(bh, "b_count=%d",
atomic_read(&(bh->b_count)));
mb_cache_entry_touch(ext2_mb_cache, ce);
mb_cache_entry_put(ext2_mb_cache, ce);
mb_cache_entry_touch(ea_block_cache, ce);
mb_cache_entry_put(ea_block_cache, ce);
return bh;
}
unlock_buffer(bh);
brelse(bh);
}
ce = mb_cache_entry_find_next(ext2_mb_cache, ce);
ce = mb_cache_entry_find_next(ea_block_cache, ce);
}
return NULL;
}