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Date: Sat, 21 May 2011 19:43:10 -0700
From: Manish Katiyar <mkatiyar@...il.com>
To: Jan Kara <jack@...e.cz>
Cc: ext4 <linux-ext4@...r.kernel.org>, mkatiyar@...il.com,
"Theodore Ts'o" <tytso@....edu>
Subject: Re: [PATCH 2/5] ext4 : Update low level ext4 journal routines to
specify gfp_mask for transaction allocation.
On Wed, May 11, 2011 at 9:04 AM, Jan Kara <jack@...e.cz> wrote:
> On Sun 24-04-11 17:13:18, Manish Katiyar wrote:
>> Update low level ext4 journal routines to pass an extra parameter
>> to journal allocation routines to specify whether transaction allocation
>> can fail or not. With this patch ext4_journal_start() can fail due to
>> ENOMEM. Added a new interface ext4_journal_start_tryhard() which isn't
>> supposed to fail and keep retrying till the allocation succeeds.
> As I wrote in a comment in the comment to the first patch, first just
> make ext4_journal_start_sb() and similar functions pass false as a part of
> the first patch.
>
> Then it would be better to create a new function that passes true - the
> name does not really matter since it will be removed later in the series
> but it will help the review process. You can call it
> ext4_journal_start_sb_enomem() or whatever. This way we keep backward
> compatibility because currently all call sites really expect the retry
> behavior.
Hi Jan,
Here is the updated patch incorporating your comments. This adds a new
function ext4_journal_start_failok and updates the ext4 code where we
can fail.
This patch adds a new wrapper ext4_journal_start_failok() which
can fail with -ENOMEM. Update the ext4 code with this, where callers
are ok failing the transaction start.
Signed-off-by: Manish Katiyar <mkatiyar@...il.com>
---
fs/ext4/acl.c | 6 +++---
fs/ext4/ext4_jbd2.h | 10 +++++++++-
fs/ext4/extents.c | 2 +-
fs/ext4/inode.c | 19 +++++++++++--------
fs/ext4/ioctl.c | 4 ++--
fs/ext4/migrate.c | 4 ++--
fs/ext4/move_extent.c | 2 +-
fs/ext4/namei.c | 23 +++++++++++++++--------
fs/ext4/super.c | 17 ++++++++++++++---
fs/ext4/xattr.c | 3 ++-
fs/jbd2/transaction.c | 4 +++-
11 files changed, 63 insertions(+), 31 deletions(-)
diff --git a/fs/ext4/acl.c b/fs/ext4/acl.c
index 21eacd7..cdb1f51 100644
--- a/fs/ext4/acl.c
+++ b/fs/ext4/acl.c
@@ -350,11 +350,10 @@ ext4_acl_chmod(struct inode *inode)
int retries = 0;
retry:
- handle = ext4_journal_start(inode,
+ handle = ext4_journal_start_failok(inode,
EXT4_DATA_TRANS_BLOCKS(inode->i_sb));
if (IS_ERR(handle)) {
error = PTR_ERR(handle);
- ext4_std_error(inode->i_sb, error);
goto out;
}
error = ext4_set_acl(handle, inode, ACL_TYPE_ACCESS, clone);
@@ -449,7 +448,8 @@ ext4_xattr_set_acl(struct dentry *dentry, const
char *name, const void *value,
acl = NULL;
retry:
- handle = ext4_journal_start(inode, EXT4_DATA_TRANS_BLOCKS(inode->i_sb));
+ handle = ext4_journal_start_failok(inode,
+ EXT4_DATA_TRANS_BLOCKS(inode->i_sb));
if (IS_ERR(handle))
return PTR_ERR(handle);
error = ext4_set_acl(handle, inode, type, acl);
diff --git a/fs/ext4/ext4_jbd2.h b/fs/ext4/ext4_jbd2.h
index 0abee1b..eae4c0a 100644
--- a/fs/ext4/ext4_jbd2.h
+++ b/fs/ext4/ext4_jbd2.h
@@ -161,6 +161,7 @@ int __ext4_handle_dirty_super(const char *where,
unsigned int line,
#define ext4_handle_dirty_super(handle, sb) \
__ext4_handle_dirty_super(__func__, __LINE__, (handle), (sb))
+handle_t *ext4_journal_start_sb_failok(struct super_block *sb, int nblocks);
handle_t *ext4_journal_start_sb(struct super_block *sb, int nblocks);
int __ext4_journal_stop(const char *where, unsigned int line,
handle_t *handle);
@@ -202,7 +203,14 @@ static inline int
ext4_handle_has_enough_credits(handle_t *handle, int needed)
return 1;
}
-static inline handle_t *ext4_journal_start(struct inode *inode, int nblocks)
+static inline handle_t *ext4_journal_start_failok(struct inode *inode,
+ int nblocks)
+{
+ return ext4_journal_start_sb_failok(inode->i_sb, nblocks);
+}
+
+static inline handle_t *ext4_journal_start(struct inode *inode,
+ int nblocks)
{
return ext4_journal_start_sb(inode->i_sb, nblocks);
}
diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c
index 4890d6f..5cb3cb2 100644
--- a/fs/ext4/extents.c
+++ b/fs/ext4/extents.c
@@ -3685,7 +3685,7 @@ retry:
while (ret >= 0 && ret < max_blocks) {
map.m_lblk = map.m_lblk + ret;
map.m_len = max_blocks = max_blocks - ret;
- handle = ext4_journal_start(inode, credits);
+ handle = ext4_journal_start_failok(inode, credits);
if (IS_ERR(handle)) {
ret = PTR_ERR(handle);
break;
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index f2fa5e8..f7b2d4d 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -1624,7 +1624,7 @@ static int ext4_write_begin(struct file *file,
struct address_space *mapping,
to = from + len;
retry:
- handle = ext4_journal_start(inode, needed_blocks);
+ handle = ext4_journal_start_failok(inode, needed_blocks);
if (IS_ERR(handle)) {
ret = PTR_ERR(handle);
goto out;
@@ -3126,7 +3126,7 @@ retry:
* to journalling the i_disksize update if writes to the end
* of file which has an already mapped buffer.
*/
- handle = ext4_journal_start(inode, 1);
+ handle = ext4_journal_start_failok(inode, 1);
if (IS_ERR(handle)) {
ret = PTR_ERR(handle);
goto out;
@@ -3480,7 +3480,7 @@ static ssize_t ext4_ind_direct_IO(int rw, struct
kiocb *iocb,
if (final_size > inode->i_size) {
/* Credits for sb + inode write */
- handle = ext4_journal_start(inode, 2);
+ handle = ext4_journal_start_failok(inode, 2);
if (IS_ERR(handle)) {
ret = PTR_ERR(handle);
goto out;
@@ -3523,7 +3523,7 @@ retry:
int err;
/* Credits for sb + inode write */
- handle = ext4_journal_start(inode, 2);
+ handle = ext4_journal_start_failok(inode, 2);
if (IS_ERR(handle)) {
/* This is really bad luck. We've written the data
* but cannot extend i_size. Bail out and pretend
@@ -5279,8 +5279,9 @@ int ext4_setattr(struct dentry *dentry, struct
iattr *attr)
/* (user+group)*(old+new) structure, inode write (sb,
* inode block, ? - but truncate inode update has it) */
- handle = ext4_journal_start(inode, (EXT4_MAXQUOTAS_INIT_BLOCKS(inode->i_sb)+
- EXT4_MAXQUOTAS_DEL_BLOCKS(inode->i_sb))+3);
+ handle = ext4_journal_start_failok(inode,
+ (EXT4_MAXQUOTAS_INIT_BLOCKS(inode->i_sb)+
+ EXT4_MAXQUOTAS_DEL_BLOCKS(inode->i_sb))+3);
if (IS_ERR(handle)) {
error = PTR_ERR(handle);
goto err_out;
@@ -5315,7 +5316,7 @@ int ext4_setattr(struct dentry *dentry, struct
iattr *attr)
(ext4_test_inode_flag(inode, EXT4_INODE_EOFBLOCKS)))) {
handle_t *handle;
- handle = ext4_journal_start(inode, 3);
+ handle = ext4_journal_start_failok(inode, 3);
if (IS_ERR(handle)) {
error = PTR_ERR(handle);
goto err_out;
@@ -5371,7 +5372,9 @@ int ext4_setattr(struct dentry *dentry, struct
iattr *attr)
rc = ext4_acl_chmod(inode);
err_out:
- ext4_std_error(inode->i_sb, error);
+ if (error != -ENOMEM) {
+ ext4_std_error(inode->i_sb, error);
+ }
if (!error)
error = rc;
return error;
diff --git a/fs/ext4/ioctl.c b/fs/ext4/ioctl.c
index 808c554..4fc2630 100644
--- a/fs/ext4/ioctl.c
+++ b/fs/ext4/ioctl.c
@@ -101,7 +101,7 @@ long ext4_ioctl(struct file *filp, unsigned int
cmd, unsigned long arg)
} else if (oldflags & EXT4_EOFBLOCKS_FL)
ext4_truncate(inode);
- handle = ext4_journal_start(inode, 1);
+ handle = ext4_journal_start_failok(inode, 1);
if (IS_ERR(handle)) {
err = PTR_ERR(handle);
goto flags_out;
@@ -157,7 +157,7 @@ flags_out:
goto setversion_out;
}
- handle = ext4_journal_start(inode, 1);
+ handle = ext4_journal_start_failok(inode, 1);
if (IS_ERR(handle)) {
err = PTR_ERR(handle);
goto setversion_out;
diff --git a/fs/ext4/migrate.c b/fs/ext4/migrate.c
index 92816b4..8870746 100644
--- a/fs/ext4/migrate.c
+++ b/fs/ext4/migrate.c
@@ -484,7 +484,7 @@ int ext4_ext_migrate(struct inode *inode)
*/
return retval;
- handle = ext4_journal_start(inode,
+ handle = ext4_journal_start_failok(inode,
EXT4_DATA_TRANS_BLOCKS(inode->i_sb) +
EXT4_INDEX_EXTRA_TRANS_BLOCKS + 3 +
EXT4_MAXQUOTAS_INIT_BLOCKS(inode->i_sb)
@@ -533,7 +533,7 @@ int ext4_ext_migrate(struct inode *inode)
ext4_set_inode_state(inode, EXT4_STATE_EXT_MIGRATE);
up_read((&EXT4_I(inode)->i_data_sem));
- handle = ext4_journal_start(inode, 1);
+ handle = ext4_journal_start_failok(inode, 1);
if (IS_ERR(handle)) {
/*
* It is impossible to update on-disk structures without
diff --git a/fs/ext4/move_extent.c b/fs/ext4/move_extent.c
index b9f3e78..3afd60d 100644
--- a/fs/ext4/move_extent.c
+++ b/fs/ext4/move_extent.c
@@ -813,7 +813,7 @@ move_extent_per_page(struct file *o_filp, struct
inode *donor_inode,
* inode and donor_inode may change each different metadata blocks.
*/
jblocks = ext4_writepage_trans_blocks(orig_inode) * 2;
- handle = ext4_journal_start(orig_inode, jblocks);
+ handle = ext4_journal_start_failok(orig_inode, jblocks);
if (IS_ERR(handle)) {
*err = PTR_ERR(handle);
return 0;
diff --git a/fs/ext4/namei.c b/fs/ext4/namei.c
index 67fd0b0..0ad321b5 100644
--- a/fs/ext4/namei.c
+++ b/fs/ext4/namei.c
@@ -1738,7 +1738,8 @@ static int ext4_create(struct inode *dir, struct
dentry *dentry, int mode,
dquot_initialize(dir);
retry:
- handle = ext4_journal_start(dir, EXT4_DATA_TRANS_BLOCKS(dir->i_sb) +
+ handle = ext4_journal_start_failok(dir,
+ EXT4_DATA_TRANS_BLOCKS(dir->i_sb) +
EXT4_INDEX_EXTRA_TRANS_BLOCKS + 3 +
EXT4_MAXQUOTAS_INIT_BLOCKS(dir->i_sb));
if (IS_ERR(handle))
@@ -1774,7 +1775,8 @@ static int ext4_mknod(struct inode *dir, struct
dentry *dentry,
dquot_initialize(dir);
retry:
- handle = ext4_journal_start(dir, EXT4_DATA_TRANS_BLOCKS(dir->i_sb) +
+ handle = ext4_journal_start_failok(dir,
+ EXT4_DATA_TRANS_BLOCKS(dir->i_sb) +
EXT4_INDEX_EXTRA_TRANS_BLOCKS + 3 +
EXT4_MAXQUOTAS_INIT_BLOCKS(dir->i_sb));
if (IS_ERR(handle))
@@ -1813,7 +1815,8 @@ static int ext4_mkdir(struct inode *dir, struct
dentry *dentry, int mode)
dquot_initialize(dir);
retry:
- handle = ext4_journal_start(dir, EXT4_DATA_TRANS_BLOCKS(dir->i_sb) +
+ handle = ext4_journal_start_failok(dir,
+ EXT4_DATA_TRANS_BLOCKS(dir->i_sb) +
EXT4_INDEX_EXTRA_TRANS_BLOCKS + 3 +
EXT4_MAXQUOTAS_INIT_BLOCKS(dir->i_sb));
if (IS_ERR(handle))
@@ -2128,7 +2131,8 @@ static int ext4_rmdir(struct inode *dir, struct
dentry *dentry)
dquot_initialize(dir);
dquot_initialize(dentry->d_inode);
- handle = ext4_journal_start(dir, EXT4_DELETE_TRANS_BLOCKS(dir->i_sb));
+ handle = ext4_journal_start_failok(dir,
+ EXT4_DELETE_TRANS_BLOCKS(dir->i_sb));
if (IS_ERR(handle))
return PTR_ERR(handle);
@@ -2190,7 +2194,8 @@ static int ext4_unlink(struct inode *dir, struct
dentry *dentry)
dquot_initialize(dir);
dquot_initialize(dentry->d_inode);
- handle = ext4_journal_start(dir, EXT4_DELETE_TRANS_BLOCKS(dir->i_sb));
+ handle = ext4_journal_start_failok(dir,
+ EXT4_DELETE_TRANS_BLOCKS(dir->i_sb));
if (IS_ERR(handle))
return PTR_ERR(handle);
@@ -2248,7 +2253,8 @@ static int ext4_symlink(struct inode *dir,
dquot_initialize(dir);
retry:
- handle = ext4_journal_start(dir, EXT4_DATA_TRANS_BLOCKS(dir->i_sb) +
+ handle = ext4_journal_start_failok(dir,
+ EXT4_DATA_TRANS_BLOCKS(dir->i_sb) +
EXT4_INDEX_EXTRA_TRANS_BLOCKS + 5 +
EXT4_MAXQUOTAS_INIT_BLOCKS(dir->i_sb));
if (IS_ERR(handle))
@@ -2308,7 +2314,8 @@ static int ext4_link(struct dentry *old_dentry,
dquot_initialize(dir);
retry:
- handle = ext4_journal_start(dir, EXT4_DATA_TRANS_BLOCKS(dir->i_sb) +
+ handle = ext4_journal_start_failok(dir,
+ EXT4_DATA_TRANS_BLOCKS(dir->i_sb) +
EXT4_INDEX_EXTRA_TRANS_BLOCKS);
if (IS_ERR(handle))
return PTR_ERR(handle);
@@ -2359,7 +2366,7 @@ static int ext4_rename(struct inode *old_dir,
struct dentry *old_dentry,
* in separate transaction */
if (new_dentry->d_inode)
dquot_initialize(new_dentry->d_inode);
- handle = ext4_journal_start(old_dir, 2 *
+ handle = ext4_journal_start_failok(old_dir, 2 *
EXT4_DATA_TRANS_BLOCKS(old_dir->i_sb) +
EXT4_INDEX_EXTRA_TRANS_BLOCKS + 2);
if (IS_ERR(handle))
diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index 4e4c17f..2d57a57 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -247,7 +247,8 @@ static void ext4_put_nojournal(handle_t *handle)
* ext4 prevents a new handle from being started by s_frozen, which
* is in an upper layer.
*/
-handle_t *ext4_journal_start_sb(struct super_block *sb, int nblocks)
+static handle_t *ext4_journal_start_sb_int(struct super_block *sb,
+ int nblocks, bool errok)
{
journal_t *journal;
handle_t *handle;
@@ -279,7 +280,17 @@ 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, false);
+ return jbd2_journal_start(journal, nblocks, errok);
+}
+
+handle_t *ext4_journal_start_sb(struct super_block *sb, int nblocks)
+{
+ return ext4_journal_start_sb_int(sb, nblocks, false);
+}
+
+handle_t *ext4_journal_start_sb_failok(struct super_block *sb, int nblocks)
+{
+ return ext4_journal_start_sb_int(sb, nblocks, true);
}
/*
@@ -4654,7 +4665,7 @@ static int ext4_quota_off(struct super_block
*sb, int type)
/* Update modification times of quota files when userspace can
* start looking at them */
- handle = ext4_journal_start(inode, 1);
+ handle = ext4_journal_start_failok(inode, 1);
if (IS_ERR(handle))
goto out;
inode->i_mtime = inode->i_ctime = CURRENT_TIME;
diff --git a/fs/ext4/xattr.c b/fs/ext4/xattr.c
index b545ca1..a4be614 100644
--- a/fs/ext4/xattr.c
+++ b/fs/ext4/xattr.c
@@ -1084,7 +1084,8 @@ ext4_xattr_set(struct inode *inode, int
name_index, const char *name,
int error, retries = 0;
retry:
- handle = ext4_journal_start(inode, EXT4_DATA_TRANS_BLOCKS(inode->i_sb));
+ handle = ext4_journal_start_failok(inode,
+ EXT4_DATA_TRANS_BLOCKS(inode->i_sb));
if (IS_ERR(handle)) {
error = PTR_ERR(handle);
} else {
diff --git a/fs/jbd2/transaction.c b/fs/jbd2/transaction.c
index b5c2550..3453c29 100644
--- a/fs/jbd2/transaction.c
+++ b/fs/jbd2/transaction.c
@@ -308,6 +308,8 @@ static handle_t *new_handle(int nblocks)
* handle_t *jbd2_journal_start() - Obtain a new handle.
* @journal: Journal to start transaction on.
* @nblocks: number of block buffer we might modify
+ * @errok : True if the transaction allocation can fail
+ * with ENOMEM.
*
* We make sure that the transaction can guarantee at least nblocks of
* modified buffers in the log. We block until the log can guarantee
@@ -338,7 +340,7 @@ handle_t *jbd2_journal_start(journal_t *journal,
int nblocks, bool errok)
current->journal_info = handle;
- err = start_this_handle(journal, handle, GFP_NOFS);
+ err = start_this_handle(journal, handle, errok ? GFP_KERNEL : GFP_NOFS);
if (err < 0) {
jbd2_free_handle(handle);
current->journal_info = NULL;
--
1.7.4.1
--
Thanks -
Manish
--
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