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Commit ade1a29e authored by Badari Pulavarty's avatar Badari Pulavarty Committed by Linus Torvalds
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[PATCH] ext3: Add "-o bh" option 



This patch adds "-o bh" option to force use of buffer_heads.  This option
is needed when we make "nobh" as default - and if we run into problems.

Signed-off-by: default avatarBadari Pulavarty <pbadari@us.ibm.com>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent 71c0cd70

Documentation/filesystems/ext3.txt

+8 −0
Original line number Diff line number Diff line
@@ -113,6 +113,14 @@ noquota 
grpquota

usrquota



bh		(*)	ext3 associates buffer heads to data pages to

nobh			(a) cache disk block mapping information

			(b) link pages into transaction to provide

			    ordering guarantees.

			"bh" option forces use of buffer heads.

			"nobh" option tries to avoid associating buffer

			heads (supported only for "writeback" mode).





Specification

=============

fs/ext3/super.c

+5 −1
Original line number Diff line number Diff line
@@ -630,7 +630,7 @@ enum { 
	Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,

	Opt_nouid32, Opt_nocheck, Opt_debug, Opt_oldalloc, Opt_orlov,

	Opt_user_xattr, Opt_nouser_xattr, Opt_acl, Opt_noacl,

	Opt_reservation, Opt_noreservation, Opt_noload, Opt_nobh,

	Opt_reservation, Opt_noreservation, Opt_noload, Opt_nobh, Opt_bh,

	Opt_commit, Opt_journal_update, Opt_journal_inum, Opt_journal_dev,

	Opt_abort, Opt_data_journal, Opt_data_ordered, Opt_data_writeback,

	Opt_usrjquota, Opt_grpjquota, Opt_offusrjquota, Opt_offgrpjquota,
@@ -666,6 +666,7 @@ static match_table_t tokens = { 
	{Opt_noreservation, "noreservation"},

	{Opt_noload, "noload"},

	{Opt_nobh, "nobh"},

	{Opt_bh, "bh"},

	{Opt_commit, "commit=%u"},

	{Opt_journal_update, "journal=update"},

	{Opt_journal_inum, "journal=%u"},
@@ -1014,6 +1015,9 @@ static int parse_options (char *options, struct super_block *sb, 
		case Opt_nobh:

			set_opt(sbi->s_mount_opt, NOBH);

			break;

		case Opt_bh:

			clear_opt(sbi->s_mount_opt, NOBH);

			break;

		default:

			printk (KERN_ERR

				"EXT3-fs: Unrecognized mount option \"%s\" "