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authorTheodore Ts'o <tytso@mit.edu>2009-06-02 08:07:50 -0400
committerGreg Kroah-Hartman <gregkh@suse.de>2009-06-15 09:40:32 -0700
commitb1ed60477aaa7fefbfa109220e7d709577418bf0 (patch)
tree56f337620f8f6f8d1b5af0439d7ca75269f5e2f0
parentffe15619ef5a2e9108d13d822a9b475afb044155 (diff)
ext4: Add auto_da_alloc mount option
(cherry picked from commit afd4672dc7610b7feef5190168aa917cc2e417e4) Add a mount option which allows the user to disable automatic allocation of blocks whose allocation by delayed allocation when the file was originally truncated or when the file is renamed over an existing file. This feature is intended to save users from the effects of naive application writers, but it reduces the effectiveness of the delayed allocation code. This mount option disables this safety feature, which may be desirable for prodcutions systems where the risk of unclean shutdowns or unexpected system crashes is low. Signed-off-by: "Theodore Ts'o" <tytso@mit.edu> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
-rw-r--r--fs/ext4/ext4.h2
-rw-r--r--fs/ext4/inode.c2
-rw-r--r--fs/ext4/namei.c3
-rw-r--r--fs/ext4/super.c25
4 files changed, 17 insertions, 15 deletions
diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
index 83f685da8bea..a2bd86e30a87 100644
--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -557,7 +557,7 @@ do { \
#define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */
#define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */
#define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */
-#define EXT4_MOUNT_RESERVATION 0x10000 /* Preallocation */
+#define EXT4_MOUNT_NO_AUTO_DA_ALLOC 0x10000 /* No auto delalloc mapping */
#define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */
#define EXT4_MOUNT_NOBH 0x40000 /* No bufferheads */
#define EXT4_MOUNT_QUOTA 0x80000 /* Some quota option set */
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index 9abf8c12c67d..4fa4ee310d4b 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -3887,7 +3887,7 @@ void ext4_truncate(struct inode *inode)
if (!ext4_can_truncate(inode))
return;
- if (inode->i_size == 0)
+ if (inode->i_size == 0 && !test_opt(inode->i_sb, NO_AUTO_DA_ALLOC))
ei->i_state |= EXT4_STATE_DA_ALLOC_CLOSE;
if (EXT4_I(inode)->i_flags & EXT4_EXTENTS_FL) {
diff --git a/fs/ext4/namei.c b/fs/ext4/namei.c
index 63568ece154d..8977e60bdcbb 100644
--- a/fs/ext4/namei.c
+++ b/fs/ext4/namei.c
@@ -2457,7 +2457,8 @@ static int ext4_rename(struct inode *old_dir, struct dentry *old_dentry,
ext4_mark_inode_dirty(handle, new_inode);
if (!new_inode->i_nlink)
ext4_orphan_add(handle, new_inode);
- force_da_alloc = 1;
+ if (!test_opt(new_dir->i_sb, NO_AUTO_DA_ALLOC))
+ force_da_alloc = 1;
}
retval = 0;
diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index 39d1993cfa13..1ad3c208cf95 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -803,8 +803,6 @@ static int ext4_show_options(struct seq_file *seq, struct vfsmount *vfs)
if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT4_DEFM_ACL))
seq_puts(seq, ",noacl");
#endif
- if (!test_opt(sb, RESERVATION))
- seq_puts(seq, ",noreservation");
if (sbi->s_commit_interval != JBD2_DEFAULT_MAX_COMMIT_AGE*HZ) {
seq_printf(seq, ",commit=%u",
(unsigned) (sbi->s_commit_interval / HZ));
@@ -855,6 +853,9 @@ static int ext4_show_options(struct seq_file *seq, struct vfsmount *vfs)
if (test_opt(sb, DATA_ERR_ABORT))
seq_puts(seq, ",data_err=abort");
+ if (test_opt(sb, NO_AUTO_DA_ALLOC))
+ seq_puts(seq, ",auto_da_alloc=0");
+
ext4_show_quota_options(seq, sb);
return 0;
}
@@ -1002,7 +1003,7 @@ enum {
Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, Opt_err_ro,
Opt_nouid32, 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_bh,
+ Opt_auto_da_alloc, Opt_noload, Opt_nobh, Opt_bh,
Opt_commit, Opt_min_batch_time, Opt_max_batch_time,
Opt_journal_update, Opt_journal_dev,
Opt_journal_checksum, Opt_journal_async_commit,
@@ -1037,8 +1038,6 @@ static const match_table_t tokens = {
{Opt_nouser_xattr, "nouser_xattr"},
{Opt_acl, "acl"},
{Opt_noacl, "noacl"},
- {Opt_reservation, "reservation"},
- {Opt_noreservation, "noreservation"},
{Opt_noload, "noload"},
{Opt_nobh, "nobh"},
{Opt_bh, "bh"},
@@ -1073,6 +1072,7 @@ static const match_table_t tokens = {
{Opt_nodelalloc, "nodelalloc"},
{Opt_inode_readahead_blks, "inode_readahead_blks=%u"},
{Opt_journal_ioprio, "journal_ioprio=%u"},
+ {Opt_auto_da_alloc, "auto_da_alloc=%u"},
{Opt_err, NULL},
};
@@ -1205,12 +1205,6 @@ static int parse_options(char *options, struct super_block *sb,
"not supported\n");
break;
#endif
- case Opt_reservation:
- set_opt(sbi->s_mount_opt, RESERVATION);
- break;
- case Opt_noreservation:
- clear_opt(sbi->s_mount_opt, RESERVATION);
- break;
case Opt_journal_update:
/* @@@ FIXME */
/* Eventually we will want to be able to create
@@ -1471,6 +1465,14 @@ set_qf_format:
*journal_ioprio = IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE,
option);
break;
+ case Opt_auto_da_alloc:
+ if (match_int(&args[0], &option))
+ return 0;
+ if (option)
+ clear_opt(sbi->s_mount_opt, NO_AUTO_DA_ALLOC);
+ else
+ set_opt(sbi->s_mount_opt,NO_AUTO_DA_ALLOC);
+ break;
default:
printk(KERN_ERR
"EXT4-fs: Unrecognized mount option \"%s\" "
@@ -2099,7 +2101,6 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent)
sbi->s_min_batch_time = EXT4_DEF_MIN_BATCH_TIME;
sbi->s_max_batch_time = EXT4_DEF_MAX_BATCH_TIME;
- set_opt(sbi->s_mount_opt, RESERVATION);
set_opt(sbi->s_mount_opt, BARRIER);
/*