| Message ID | 1415968484-9648-1-git-send-email-dsterba@suse.cz (mailing list archive) |
|---|---|
| State | Under Review |
| Headers | show |
On Fri, Nov 14, 2014 at 12:34 PM, David Sterba <dsterba@suse.cz> wrote: > If a pending change is requested, it's not processed unless there is a > transaction commit about to happen, not even after sync or SYNC_FS > ioctl. For example a remount that toggles the inode_cache option will > not take effect after sync on a quiescent filesystem. > > Signed-off-by: David Sterba <dsterba@suse.cz> > --- > > v2: catch error from btrfs_start_transaction V2 didn't make it to 3.19: https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=6b5fe46dfa52441f49c7432b1c1b1cb767834708 > > fs/btrfs/super.c | 14 +++++++++++--- > 1 file changed, 11 insertions(+), 3 deletions(-) > > diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c > index 54bd91ece35b..0cf589402d8d 100644 > --- a/fs/btrfs/super.c > +++ b/fs/btrfs/super.c > @@ -993,9 +993,17 @@ int btrfs_sync_fs(struct super_block *sb, int wait) > trans = btrfs_attach_transaction_barrier(root); > if (IS_ERR(trans)) { > /* no transaction, don't bother */ > - if (PTR_ERR(trans) == -ENOENT) > - return 0; > - return PTR_ERR(trans); > + if (PTR_ERR(trans) == -ENOENT) { > + /* > + * Exit unless we have some pending changes > + * that need to go through commit > + */ > + if (fs_info->pending_changes == 0) > + return 0; > + trans = btrfs_start_transaction(root, 0); > + } > + if (IS_ERR(trans)) > + return PTR_ERR(trans); > } > return btrfs_commit_transaction(trans, root); > } > -- > 2.1.3 > > -- > To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html
diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c index 54bd91ece35b..0cf589402d8d 100644 --- a/fs/btrfs/super.c +++ b/fs/btrfs/super.c @@ -993,9 +993,17 @@ int btrfs_sync_fs(struct super_block *sb, int wait) trans = btrfs_attach_transaction_barrier(root); if (IS_ERR(trans)) { /* no transaction, don't bother */ - if (PTR_ERR(trans) == -ENOENT) - return 0; - return PTR_ERR(trans); + if (PTR_ERR(trans) == -ENOENT) { + /* + * Exit unless we have some pending changes + * that need to go through commit + */ + if (fs_info->pending_changes == 0) + return 0; + trans = btrfs_start_transaction(root, 0); + } + if (IS_ERR(trans)) + return PTR_ERR(trans); } return btrfs_commit_transaction(trans, root); }
If a pending change is requested, it's not processed unless there is a transaction commit about to happen, not even after sync or SYNC_FS ioctl. For example a remount that toggles the inode_cache option will not take effect after sync on a quiescent filesystem. Signed-off-by: David Sterba <dsterba@suse.cz> --- v2: catch error from btrfs_start_transaction fs/btrfs/super.c | 14 +++++++++++--- 1 file changed, 11 insertions(+), 3 deletions(-)