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UBIFS: remove fast unmounting

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This UBIFS feature has never worked properly, and it was a mistake
to add it because we simply have no use-cases. So, lets still accept
the fast_unmount mount option, but ignore it. This does not change
much, because UBIFS commit in sync_fs anyway, and sync_fs is called
while unmounting.

Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
This commit is contained in:
Artem Bityutskiy 2009-01-29 16:34:30 +02:00
parent a2b9df3ff6
commit 27ad279933
3 changed files with 5 additions and 54 deletions
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7
Documentation/filesystems/ubifs.txt
View File

@ -79,13 +79,6 @@ Mount options
(*) == default.
norm_unmount (*) commit on unmount; the journal is committed
when the file-system is unmounted so that the
next mount does not have to replay the journal
and it becomes very fast;
fast_unmount do not commit on unmount; this option makes
unmount faster, but the next mount slower
because of the need to replay the journal.
bulk_read read more in one go to take advantage of flash
media that read faster sequentially
no_bulk_read (*) do not bulk-read

50
fs/ubifs/super.c
View File

@ -957,13 +957,16 @@ static int ubifs_parse_options(struct ubifs_info *c, char *options,
token = match_token(p, tokens, args);
switch (token) {
/*
* %Opt_fast_unmount and %Opt_norm_unmount options are ignored.
* We accepte them in order to be backware-compatible. But this
* should be removed at some point.
*/
case Opt_fast_unmount:
c->mount_opts.unmount_mode = 2;
c->fast_unmount = 1;
break;
case Opt_norm_unmount:
c->mount_opts.unmount_mode = 1;
c->fast_unmount = 0;
break;
case Opt_bulk_read:
c->mount_opts.bulk_read = 2;
@ -1359,7 +1362,6 @@ static int mount_ubifs(struct ubifs_info *c)
c->uuid[4], c->uuid[5], c->uuid[6], c->uuid[7],
c->uuid[8], c->uuid[9], c->uuid[10], c->uuid[11],
c->uuid[12], c->uuid[13], c->uuid[14], c->uuid[15]);
dbg_msg("fast unmount: %d", c->fast_unmount);
dbg_msg("big_lpt %d", c->big_lpt);
dbg_msg("log LEBs: %d (%d - %d)",
c->log_lebs, UBIFS_LOG_LNUM, c->log_last);
@ -1615,38 +1617,6 @@ static int ubifs_remount_rw(struct ubifs_info *c)
return err;
}
/**
* commit_on_unmount - commit the journal when un-mounting.
* @c: UBIFS file-system description object
*
* This function is called during un-mounting and re-mounting, and it commits
* the journal unless the "fast unmount" mode is enabled.
*/
static void commit_on_unmount(struct ubifs_info *c)
{
long long bud_bytes;
if (!c->fast_unmount) {
dbg_gen("skip committing - fast unmount enabled");
return;
}
/*
* This function is called before the background thread is stopped, so
* we may race with ongoing commit, which means we have to take
* @c->bud_lock to access @c->bud_bytes.
*/
spin_lock(&c->buds_lock);
bud_bytes = c->bud_bytes;
spin_unlock(&c->buds_lock);
if (bud_bytes) {
dbg_gen("run commit");
ubifs_run_commit(c);
} else
dbg_gen("journal is empty, do not run commit");
}
/**
* ubifs_remount_ro - re-mount in read-only mode.
* @c: UBIFS file-system description object
@ -1661,7 +1631,6 @@ static void ubifs_remount_ro(struct ubifs_info *c)
ubifs_assert(!c->need_recovery);
ubifs_assert(!(c->vfs_sb->s_flags & MS_RDONLY));
commit_on_unmount(c);
mutex_lock(&c->umount_mutex);
if (c->bgt) {
kthread_stop(c->bgt);
@ -2077,15 +2046,6 @@ static int ubifs_get_sb(struct file_system_type *fs_type, int flags,
static void ubifs_kill_sb(struct super_block *sb)
{
struct ubifs_info *c = sb->s_fs_info;
/*
* We do 'commit_on_unmount()' here instead of 'ubifs_put_super()'
* in order to be outside BKL.
*/
if (sb->s_root && !(sb->s_flags & MS_RDONLY))
commit_on_unmount(c);
/* The un-mount routine is actually done in put_super() */
generic_shutdown_super(sb);
}

2
fs/ubifs/ubifs.h
View File

@ -961,7 +961,6 @@ struct ubifs_debug_info;
* @cs_lock: commit state lock
* @cmt_wq: wait queue to sleep on if the log is full and a commit is running
*
* @fast_unmount: do not run journal commit before un-mounting
* @big_lpt: flag that LPT is too big to write whole during commit
* @no_chk_data_crc: do not check CRCs when reading data nodes (except during
* recovery)
@ -1202,7 +1201,6 @@ struct ubifs_info {
spinlock_t cs_lock;
wait_queue_head_t cmt_wq;
unsigned int fast_unmount:1;
unsigned int big_lpt:1;
unsigned int no_chk_data_crc:1;
unsigned int bulk_read:1;