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author | Theodore Ts'o <tytso@mit.edu> | 2011-01-10 17:29:43 (GMT) |
---|---|---|
committer | Theodore Ts'o <tytso@mit.edu> | 2011-01-10 17:29:43 (GMT) |
commit | 8aefcd557d26d0023a36f9ec5afbf55e59f8f26b (patch) | |
tree | e13143306cd64525cddd2cc2513c448275a1d95a /fs/ext4 | |
parent | 353eb83c1422c6326eaab30ce044a179c6018169 (diff) | |
download | linux-fsl-qoriq-8aefcd557d26d0023a36f9ec5afbf55e59f8f26b.tar.xz |
ext4: dynamically allocate the jbd2_inode in ext4_inode_info as necessary
Replace the jbd2_inode structure (which is 48 bytes) with a pointer
and only allocate the jbd2_inode when it is needed --- that is, when
the file system has a journal present and the inode has been opened
for writing. This allows us to further slim down the ext4_inode_info
structure.
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Diffstat (limited to 'fs/ext4')
-rw-r--r-- | fs/ext4/ext4.h | 2 | ||||
-rw-r--r-- | fs/ext4/ext4_jbd2.h | 2 | ||||
-rw-r--r-- | fs/ext4/file.c | 22 | ||||
-rw-r--r-- | fs/ext4/inode.c | 17 | ||||
-rw-r--r-- | fs/ext4/super.c | 16 |
5 files changed, 43 insertions, 16 deletions
diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h index 2fb531c..32b7daa 100644 --- a/fs/ext4/ext4.h +++ b/fs/ext4/ext4.h @@ -811,7 +811,7 @@ struct ext4_inode_info { */ struct rw_semaphore i_data_sem; struct inode vfs_inode; - struct jbd2_inode jinode; + struct jbd2_inode *jinode; struct ext4_ext_cache i_cached_extent; /* diff --git a/fs/ext4/ext4_jbd2.h b/fs/ext4/ext4_jbd2.h index b0bd792..d8b992e 100644 --- a/fs/ext4/ext4_jbd2.h +++ b/fs/ext4/ext4_jbd2.h @@ -253,7 +253,7 @@ static inline int ext4_journal_force_commit(journal_t *journal) static inline int ext4_jbd2_file_inode(handle_t *handle, struct inode *inode) { if (ext4_handle_valid(handle)) - return jbd2_journal_file_inode(handle, &EXT4_I(inode)->jinode); + return jbd2_journal_file_inode(handle, EXT4_I(inode)->jinode); return 0; } diff --git a/fs/ext4/file.c b/fs/ext4/file.c index 5a5c55d..bb003dc 100644 --- a/fs/ext4/file.c +++ b/fs/ext4/file.c @@ -104,6 +104,7 @@ static int ext4_file_open(struct inode * inode, struct file * filp) { struct super_block *sb = inode->i_sb; struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb); + struct ext4_inode_info *ei = EXT4_I(inode); struct vfsmount *mnt = filp->f_path.mnt; struct path path; char buf[64], *cp; @@ -127,6 +128,27 @@ static int ext4_file_open(struct inode * inode, struct file * filp) ext4_mark_super_dirty(sb); } } + /* + * Set up the jbd2_inode if we are opening the inode for + * writing and the journal is present + */ + if (sbi->s_journal && !ei->jinode && (filp->f_mode & FMODE_WRITE)) { + struct jbd2_inode *jinode = jbd2_alloc_inode(GFP_KERNEL); + + spin_lock(&inode->i_lock); + if (!ei->jinode) { + if (!jinode) { + spin_unlock(&inode->i_lock); + return -ENOMEM; + } + ei->jinode = jinode; + jbd2_journal_init_jbd_inode(ei->jinode, inode); + jinode = NULL; + } + spin_unlock(&inode->i_lock); + if (unlikely(jinode != NULL)) + jbd2_free_inode(jinode); + } return dquot_file_open(inode, filp); } diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c index 0801ee6..2693fcd 100644 --- a/fs/ext4/inode.c +++ b/fs/ext4/inode.c @@ -55,10 +55,17 @@ static inline int ext4_begin_ordered_truncate(struct inode *inode, loff_t new_size) { trace_ext4_begin_ordered_truncate(inode, new_size); - return jbd2_journal_begin_ordered_truncate( - EXT4_SB(inode->i_sb)->s_journal, - &EXT4_I(inode)->jinode, - new_size); + /* + * If jinode is zero, then we never opened the file for + * writing, so there's no need to call + * jbd2_journal_begin_ordered_truncate() since there's no + * outstanding writes we need to flush. + */ + if (!EXT4_I(inode)->jinode) + return 0; + return jbd2_journal_begin_ordered_truncate(EXT4_JOURNAL(inode), + EXT4_I(inode)->jinode, + new_size); } static void ext4_invalidatepage(struct page *page, unsigned long offset); @@ -4054,7 +4061,7 @@ int ext4_block_truncate_page(handle_t *handle, if (ext4_should_journal_data(inode)) { err = ext4_handle_dirty_metadata(handle, inode, bh); } else { - if (ext4_should_order_data(inode)) + if (ext4_should_order_data(inode) && EXT4_I(inode)->jinode) err = ext4_jbd2_file_inode(handle, inode); mark_buffer_dirty(bh); } diff --git a/fs/ext4/super.c b/fs/ext4/super.c index f5960d6..1cd4326 100644 --- a/fs/ext4/super.c +++ b/fs/ext4/super.c @@ -818,12 +818,6 @@ static struct inode *ext4_alloc_inode(struct super_block *sb) memset(&ei->i_cached_extent, 0, sizeof(struct ext4_ext_cache)); INIT_LIST_HEAD(&ei->i_prealloc_list); spin_lock_init(&ei->i_prealloc_lock); - /* - * Note: We can be called before EXT4_SB(sb)->s_journal is set, - * therefore it can be null here. Don't check it, just initialize - * jinode. - */ - jbd2_journal_init_jbd_inode(&ei->jinode, &ei->vfs_inode); ei->i_reserved_data_blocks = 0; ei->i_reserved_meta_blocks = 0; ei->i_allocated_meta_blocks = 0; @@ -832,6 +826,7 @@ static struct inode *ext4_alloc_inode(struct super_block *sb) #ifdef CONFIG_QUOTA ei->i_reserved_quota = 0; #endif + ei->jinode = NULL; INIT_LIST_HEAD(&ei->i_completed_io_list); spin_lock_init(&ei->i_completed_io_lock); ei->cur_aio_dio = NULL; @@ -900,9 +895,12 @@ void ext4_clear_inode(struct inode *inode) end_writeback(inode); dquot_drop(inode); ext4_discard_preallocations(inode); - if (EXT4_JOURNAL(inode)) - jbd2_journal_release_jbd_inode(EXT4_SB(inode->i_sb)->s_journal, - &EXT4_I(inode)->jinode); + if (EXT4_I(inode)->jinode) { + jbd2_journal_release_jbd_inode(EXT4_JOURNAL(inode), + EXT4_I(inode)->jinode); + jbd2_free_inode(EXT4_I(inode)->jinode); + EXT4_I(inode)->jinode = NULL; + } } static inline void ext4_show_quota_options(struct seq_file *seq, |