From: Manish Katiyar Subject: Re: [PATCH 1/5] jbd2: Pass extra bool parameter in journal routines to specify if its ok to fail the journal transaction allocation. Date: Wed, 18 May 2011 01:36:48 -0700 Message-ID: References: <20110511155447.GH5057@quack.suse.cz> <20110516155138.GI5344@quack.suse.cz> <20110518080930.GC25632@quack.suse.cz> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: QUOTED-PRINTABLE Cc: ext4 , "Theodore Ts'o" To: Jan Kara Return-path: Received: from mail-qy0-f181.google.com ([209.85.216.181]:63088 "EHLO mail-qy0-f181.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755887Ab1ERIhJ convert rfc822-to-8bit (ORCPT ); Wed, 18 May 2011 04:37:09 -0400 Received: by qyg14 with SMTP id 14so762933qyg.19 for ; Wed, 18 May 2011 01:37:08 -0700 (PDT) In-Reply-To: <20110518080930.GC25632@quack.suse.cz> Sender: linux-ext4-owner@vger.kernel.org List-ID: On Wed, May 18, 2011 at 1:09 AM, Jan Kara wrote: > On Tue 17-05-11 23:38:05, Manish Katiyar wrote: >> On Mon, May 16, 2011 at 8:51 AM, Jan Kara wrote: >> > =A0Hello, >> > >> > On Thu 12-05-11 23:37:05, Manish Katiyar wrote: >> >> On Wed, May 11, 2011 at 8:54 AM, Jan Kara wrote: >> >> > =A0Hi, >> >> > >> >> > =A0sorry I got to your patches with a delay. One general note -= please do >> >> > not attach patches. It is enough to have them in the email... >> >> > >> >> > On Sun 24-04-11 17:10:41, Manish Katiyar wrote: >> >> >> Pass extra bool parameter in journal routines to specify if it= s ok to >> >> >> fail the journal transaction allocation. If 'true' is passed >> >> >> transaction allocation is done through GFP_KERNEL =A0and ENOME= M is >> >> >> returned else GFP_NOFS is used. >> >> > =A0Please, do not mix error handling with gfp masks. Instead ju= st rename >> >> > jbd2__journal_start() to jbd2_journal_start() and change gfp_ma= sk parameter >> >> > to "bool errok". >> >> >> >> ok. >> >> >> >> > Use GFP_NOFS gfp mask for start_this_handle(). >> >> I think I didn't completely understand this line. You meant passi= ng >> >> GFP_KERNEL or GFP_NOFS based on errok right ? >> > =A0No, I meant passing GFP_NOFS always. Currently, GFP_NOFS is use= d in all >> > the cases (noone uses GFP_KERNEL variant) and GFP_KERNEL can reall= y be used >> > only when we do not hold other filesystem locks (as GFP_KERNEL all= ocation >> > can recurse back into filesystem to reclaim memory). So using GFP_= KERNEL >> > would need more auditting and is a separate issue anyway. >> >> Hi Jan, >> >> How about this ? As suggested I have removed special handlers for >> ocfs2, always pass false as default for allocation and have removed >> jbd2__journal_start and collapsed it in jbd2_journal_start. >> >> >> Pass extra bool parameter in journal routines to specify if its ok t= o >> fail the journal transaction allocation. =A0Update ocfs2 and ext4 ro= utines to >> pass false for the updated journal interface. > =A0Yes, now the patch looks good! Thanks. Just one nit below: Thanks a lot. Fixed the newline issue. Here is the updated diff. Pass extra bool parameter in journal routines to specify if its ok to fail the journal transaction allocation. Update ocfs2 and ext4 routine= s to pass false for the updated journal interface. Signed-off-by: Manish Katiyar --- fs/ext4/ext4_jbd2.h | 2 +- fs/ext4/super.c | 2 +- fs/jbd2/transaction.c | 24 +++++------------------- fs/ocfs2/journal.c | 6 +++--- include/linux/jbd2.h | 6 ++---- 5 files changed, 12 insertions(+), 28 deletions(-) diff --git a/fs/ext4/ext4_jbd2.h b/fs/ext4/ext4_jbd2.h index d0f5353..0abee1b 100644 --- a/fs/ext4/ext4_jbd2.h +++ b/fs/ext4/ext4_jbd2.h @@ -225,7 +225,7 @@ static inline int ext4_journal_extend(handle_t *handle, int nblocks) static inline int ext4_journal_restart(handle_t *handle, int nblocks) { if (ext4_handle_valid(handle)) - return jbd2_journal_restart(handle, nblocks); + return jbd2_journal_restart(handle, nblocks, false); return 0; } diff --git a/fs/ext4/super.c b/fs/ext4/super.c index 8553dfb..4e4c17f 100644 --- a/fs/ext4/super.c +++ b/fs/ext4/super.c @@ -279,7 +279,7 @@ handle_t *ext4_journal_start_sb(struct super_block *sb, int nblocks) ext4_abort(sb, "Detected aborted journal"); return ERR_PTR(-EROFS); } - return jbd2_journal_start(journal, nblocks); + return jbd2_journal_start(journal, nblocks, false); } /* diff --git a/fs/jbd2/transaction.c b/fs/jbd2/transaction.c index 05fa77a..b5c2550 100644 --- a/fs/jbd2/transaction.c +++ b/fs/jbd2/transaction.c @@ -318,7 +318,7 @@ static handle_t *new_handle(int nblocks) * * Return a pointer to a newly allocated handle, or NULL on failure */ -handle_t *jbd2__journal_start(journal_t *journal, int nblocks, int gfp= _mask) +handle_t *jbd2_journal_start(journal_t *journal, int nblocks, bool err= ok) { handle_t *handle =3D journal_current_handle(); int err; @@ -338,7 +338,7 @@ handle_t *jbd2__journal_start(journal_t *journal, int nblocks, int gfp_mask) current->journal_info =3D handle; - err =3D start_this_handle(journal, handle, gfp_mask); + err =3D start_this_handle(journal, handle, GFP_NOFS); if (err < 0) { jbd2_free_handle(handle); current->journal_info =3D NULL; @@ -346,13 +346,6 @@ handle_t *jbd2__journal_start(journal_t *journal, int nblocks, int gfp_mask) } return handle; } -EXPORT_SYMBOL(jbd2__journal_start); - - -handle_t *jbd2_journal_start(journal_t *journal, int nblocks) -{ - return jbd2__journal_start(journal, nblocks, GFP_NOFS); -} EXPORT_SYMBOL(jbd2_journal_start); @@ -441,7 +434,7 @@ out: * transaction capabable of guaranteeing the requested number of * credits. */ -int jbd2__journal_restart(handle_t *handle, int nblocks, int gfp_mask) +int jbd2_journal_restart(handle_t *handle, int nblocks, bool errok) { transaction_t *transaction =3D handle->h_transaction; journal_t *journal =3D transaction->t_journal; @@ -477,16 +470,9 @@ int jbd2__journal_restart(handle_t *handle, int nblocks, int gfp_mask) lock_map_release(&handle->h_lockdep_map); handle->h_buffer_credits =3D nblocks; - ret =3D start_this_handle(journal, handle, gfp_mask); + ret =3D start_this_handle(journal, handle, GFP_NOFS); return ret; } -EXPORT_SYMBOL(jbd2__journal_restart); - - -int jbd2_journal_restart(handle_t *handle, int nblocks) -{ - return jbd2__journal_restart(handle, nblocks, GFP_NOFS); -} EXPORT_SYMBOL(jbd2_journal_restart); /** @@ -1436,7 +1422,7 @@ int jbd2_journal_force_commit(journal_t *journal) handle_t *handle; int ret; - handle =3D jbd2_journal_start(journal, 1); + handle =3D jbd2_journal_start(journal, 1, false); if (IS_ERR(handle)) { ret =3D PTR_ERR(handle); } else { diff --git a/fs/ocfs2/journal.c b/fs/ocfs2/journal.c index b141a44..cca0f76 100644 --- a/fs/ocfs2/journal.c +++ b/fs/ocfs2/journal.c @@ -353,11 +353,11 @@ handle_t *ocfs2_start_trans(struct ocfs2_super *osb, int max_buffs) /* Nested transaction? Just return the handle... */ if (journal_current_handle()) - return jbd2_journal_start(journal, max_buffs); + return jbd2_journal_start(journal, max_buffs, false); down_read(&osb->journal->j_trans_barrier); - handle =3D jbd2_journal_start(journal, max_buffs); + handle =3D jbd2_journal_start(journal, max_buffs, false); if (IS_ERR(handle)) { up_read(&osb->journal->j_trans_barrier); @@ -438,7 +438,7 @@ int ocfs2_extend_trans(handle_t *handle, int nblock= s) if (status > 0) { trace_ocfs2_extend_trans_restart(old_nblocks + nblocks); status =3D jbd2_journal_restart(handle, - old_nblocks + nblocks); + old_nblocks + nblocks, false); if (status < 0) { mlog_errno(status); goto bail; diff --git a/include/linux/jbd2.h b/include/linux/jbd2.h index a32dcae..67f0f4f 100644 --- a/include/linux/jbd2.h +++ b/include/linux/jbd2.h @@ -1103,10 +1103,8 @@ static inline handle_t *journal_current_handle(v= oid) * Register buffer modifications against the current transaction. */ -extern handle_t *jbd2_journal_start(journal_t *, int nblocks); -extern handle_t *jbd2__journal_start(journal_t *, int nblocks, int gfp= _mask); -extern int jbd2_journal_restart(handle_t *, int nblocks); -extern int jbd2__journal_restart(handle_t *, int nblocks, int gfp_mas= k); +extern handle_t *jbd2_journal_start(journal_t *, int nblocks, bool err= ok); +extern int jbd2_journal_restart(handle_t *, int nblocks, bool errok); extern int jbd2_journal_extend (handle_t *, int nblocks); extern int jbd2_journal_get_write_access(handle_t *, struct buffer_he= ad *); extern int jbd2_journal_get_create_access (handle_t *, struct buffer_= head *); --=20 1.7.4.1 --=20 Thanks - Manish -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" i= n the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html