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ext4: main fast-commit commit path

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This patch adds main fast commit commit path handlers. The overall
patch can be divided into two inter-related parts:

(A) Metadata updates tracking

    This part consists of helper functions to track changes that need
    to be committed during a commit operation. These updates are
    maintained by Ext4 in different in-memory queues. Following are
    the APIs and their short description that are implemented in this
    patch:

    - ext4_fc_track_link/unlink/creat() - Track unlink. link and creat
      operations
    - ext4_fc_track_range() - Track changed logical block offsets
      inodes
    - ext4_fc_track_inode() - Track inodes
    - ext4_fc_mark_ineligible() - Mark file system fast commit
      ineligible()
    - ext4_fc_start_update() / ext4_fc_stop_update() /
      ext4_fc_start_ineligible() / ext4_fc_stop_ineligible() These
      functions are useful for co-ordinating inode updates with
      commits.

(B) Main commit Path

    This part consists of functions to convert updates tracked in
    in-memory data structures into on-disk commits. Function
    ext4_fc_commit() is the main entry point to commit path.

Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Harshad Shirwadkar <harshadshirwadkar@gmail.com>
Link: https://lore.kernel.org/r/20201015203802.3597742-6-harshadshirwadkar@gmail.com
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
This commit is contained in:
Harshad Shirwadkar
2020-10-15 13:37:57 -07:00
committed by Theodore Ts'o
parent ff780b91ef
commit aa75f4d3da
13 changed files with 1707 additions and 29 deletions
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31
fs/ext4/super.c
View File

@@ -1331,6 +1331,8 @@ static struct inode *ext4_alloc_inode(struct super_block *sb)
ei->i_datasync_tid = 0;
atomic_set(&ei->i_unwritten, 0);
INIT_WORK(&ei->i_rsv_conversion_work, ext4_end_io_rsv_work);
ext4_fc_init_inode(&ei->vfs_inode);
mutex_init(&ei->i_fc_lock);
return &ei->vfs_inode;
}
@@ -1348,6 +1350,10 @@ static int ext4_drop_inode(struct inode *inode)
static void ext4_free_in_core_inode(struct inode *inode)
{
fscrypt_free_inode(inode);
if (!list_empty(&(EXT4_I(inode)->i_fc_list))) {
pr_warn("%s: inode %ld still in fc list",
__func__, inode->i_ino);
}
kmem_cache_free(ext4_inode_cachep, EXT4_I(inode));
}
@@ -1373,6 +1379,7 @@ static void init_once(void *foo)
init_rwsem(&ei->i_data_sem);
init_rwsem(&ei->i_mmap_sem);
inode_init_once(&ei->vfs_inode);
ext4_fc_init_inode(&ei->vfs_inode);
}
static int __init init_inodecache(void)
@@ -1401,6 +1408,7 @@ static void destroy_inodecache(void)
void ext4_clear_inode(struct inode *inode)
{
ext4_fc_del(inode);
invalidate_inode_buffers(inode);
clear_inode(inode);
ext4_discard_preallocations(inode, 0);
@@ -4744,6 +4752,19 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent)
INIT_LIST_HEAD(&sbi->s_orphan); /* unlinked but open files */
mutex_init(&sbi->s_orphan_lock);
/* Initialize fast commit stuff */
atomic_set(&sbi->s_fc_subtid, 0);
atomic_set(&sbi->s_fc_ineligible_updates, 0);
INIT_LIST_HEAD(&sbi->s_fc_q[FC_Q_MAIN]);
INIT_LIST_HEAD(&sbi->s_fc_q[FC_Q_STAGING]);
INIT_LIST_HEAD(&sbi->s_fc_dentry_q[FC_Q_MAIN]);
INIT_LIST_HEAD(&sbi->s_fc_dentry_q[FC_Q_STAGING]);
sbi->s_fc_bytes = 0;
sbi->s_mount_state &= ~EXT4_FC_INELIGIBLE;
sbi->s_mount_state &= ~EXT4_FC_COMMITTING;
spin_lock_init(&sbi->s_fc_lock);
memset(&sbi->s_fc_stats, 0, sizeof(sbi->s_fc_stats));
sb->s_root = NULL;
needs_recovery = (es->s_last_orphan != 0 ||
@@ -6515,6 +6536,10 @@ static ssize_t ext4_quota_write(struct super_block *sb, int type,
brelse(bh);
out:
if (inode->i_size < off + len) {
ext4_fc_track_range(inode,
(inode->i_size > 0 ? inode->i_size - 1 : 0)
>> inode->i_sb->s_blocksize_bits,
(off + len) >> inode->i_sb->s_blocksize_bits);
i_size_write(inode, off + len);
EXT4_I(inode)->i_disksize = inode->i_size;
err2 = ext4_mark_inode_dirty(handle, inode);
@@ -6643,6 +6668,11 @@ static int __init ext4_init_fs(void)
err = init_inodecache();
if (err)
goto out1;
err = ext4_fc_init_dentry_cache();
if (err)
goto out05;
register_as_ext3();
register_as_ext2();
err = register_filesystem(&ext4_fs_type);
@@ -6653,6 +6683,7 @@ static int __init ext4_init_fs(void)
out:
unregister_as_ext2();
unregister_as_ext3();
out05:
destroy_inodecache();
out1:
ext4_exit_mballoc();