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Date: Fri, 27 May 2011 23:20:57 -0700
From: Manish Katiyar <mkatiyar@...il.com>
To: jack@...e.cz, tytso@....edu, linux-ext4@...r.kernel.org,
mfasheh@...e.com, jlbec@...lplan.org
Cc: Manish Katiyar <mkatiyar@...il.com>
Subject: [PATCH v2 2/3] jbd2: Add extra parameter in start_this_handle() to control allocation flags.
changes from v1 -> v2 :
*) Update start_this_handle to take extra parameter to specify whether
to retry the allocation or not.
*) Added jbd allocation flags for callers to control the transaction allocation
behavior. Callers can pass JBD2_TOPLEVEL if allocation needs to be done using GFP_KERNEL.
Pass extra flags in journal routines to specify if its ok to
fail in the journal transaction allocation. Passing JBD2_FAIL_OK means caller is
ok with journal start failures and can handle ENOMEM.
Update ocfs2 and ext4 routines to pass JBD2_NO_FAIL for the updated journal
interface by default, to retain the existing behavior.
Signed-off-by: Manish Katiyar <mkatiyar@...il.com>
---
fs/ext4/ext4_jbd2.h | 2 +-
fs/ext4/super.c | 2 +-
fs/jbd2/transaction.c | 44 ++++++++++++++++----------------------------
fs/ocfs2/journal.c | 8 ++++----
include/linux/jbd2.h | 13 +++++++++----
5 files changed, 31 insertions(+), 38 deletions(-)
diff --git a/fs/ext4/ext4_jbd2.h b/fs/ext4/ext4_jbd2.h
index bb85757..14e6599 100644
--- a/fs/ext4/ext4_jbd2.h
+++ b/fs/ext4/ext4_jbd2.h
@@ -220,7 +220,7 @@ 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, JBD2_NO_FAIL);
return 0;
}
diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index d9937df..aa842f3 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -295,7 +295,7 @@ 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, JBD2_NO_FAIL);
}
/*
diff --git a/fs/jbd2/transaction.c b/fs/jbd2/transaction.c
index 3eec82d..7f53589 100644
--- a/fs/jbd2/transaction.c
+++ b/fs/jbd2/transaction.c
@@ -106,6 +106,11 @@ static inline void update_t_max_wait(transaction_t *transaction,
#endif
}
+static inline int __jbd_flags_to_mask(int jbd_alloc_flags)
+{
+ return (jbd_alloc_flags & JBD2_TOPLEVEL) ? GFP_KERNEL : GFP_NOFS;
+}
+
/*
* start_this_handle: Given a handle, deal with any locking or stalling
* needed to make sure that there is enough journal space for the handle
@@ -114,13 +119,14 @@ static inline void update_t_max_wait(transaction_t *transaction,
*/
static int start_this_handle(journal_t *journal, handle_t *handle,
- int gfp_mask)
+ int jbd_alloc_flags)
{
transaction_t *transaction, *new_transaction = NULL;
tid_t tid;
int needed, need_to_start;
int nblocks = handle->h_buffer_credits;
unsigned long ts = jiffies;
+ int gfp_mask = __jbd_flags_to_mask(jbd_alloc_flags);
if (nblocks > journal->j_max_transaction_buffers) {
printk(KERN_ERR "JBD: %s wants too many credits (%d > %d)\n",
@@ -133,14 +139,7 @@ alloc_transaction:
if (!journal->j_running_transaction) {
new_transaction = kzalloc(sizeof(*new_transaction), gfp_mask);
if (!new_transaction) {
- /*
- * If __GFP_FS is not present, then we may be
- * being called from inside the fs writeback
- * layer, so we MUST NOT fail. Since
- * __GFP_NOFAIL is going away, we will arrange
- * to retry the allocation ourselves.
- */
- if ((gfp_mask & __GFP_FS) == 0) {
+ if (jbd_alloc_flags & JBD2_NO_FAIL) {
congestion_wait(BLK_RW_ASYNC, HZ/50);
goto alloc_transaction;
}
@@ -308,6 +307,7 @@ 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
+ * @jbd_alloc_flags: jbd allocation flags for transaction.
*
* We make sure that the transaction can guarantee at least nblocks of
* modified buffers in the log. We block until the log can guarantee
@@ -319,7 +319,8 @@ static handle_t *new_handle(int nblocks)
* Return a pointer to a newly allocated handle, or an ERR_PTR() value
* 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, int jbd_alloc_flags)
{
handle_t *handle = journal_current_handle();
int err;
@@ -339,7 +340,7 @@ handle_t *jbd2__journal_start(journal_t *journal, int nblocks, int gfp_mask)
current->journal_info = handle;
- err = start_this_handle(journal, handle, gfp_mask);
+ err = start_this_handle(journal, handle, jbd_alloc_flags);
if (err < 0) {
jbd2_free_handle(handle);
current->journal_info = NULL;
@@ -347,13 +348,6 @@ 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);
@@ -442,7 +436,8 @@ 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, int jbd_alloc_flags)
{
transaction_t *transaction = handle->h_transaction;
journal_t *journal = transaction->t_journal;
@@ -478,16 +473,9 @@ int jbd2__journal_restart(handle_t *handle, int nblocks, int gfp_mask)
lock_map_release(&handle->h_lockdep_map);
handle->h_buffer_credits = nblocks;
- ret = start_this_handle(journal, handle, gfp_mask);
+ ret = start_this_handle(journal, handle, jbd_alloc_flags);
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);
/**
@@ -1437,7 +1425,7 @@ int jbd2_journal_force_commit(journal_t *journal)
handle_t *handle;
int ret;
- handle = jbd2_journal_start(journal, 1);
+ handle = jbd2_journal_start(journal, 1, JBD2_NO_FAIL);
if (IS_ERR(handle)) {
ret = PTR_ERR(handle);
} else {
diff --git a/fs/ocfs2/journal.c b/fs/ocfs2/journal.c
index b141a44..a784a64 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, JBD2_NO_FAIL);
down_read(&osb->journal->j_trans_barrier);
- handle = jbd2_journal_start(journal, max_buffs);
+ handle = jbd2_journal_start(journal, max_buffs, JBD2_NO_FAIL);
if (IS_ERR(handle)) {
up_read(&osb->journal->j_trans_barrier);
@@ -437,8 +437,8 @@ int ocfs2_extend_trans(handle_t *handle, int nblocks)
if (status > 0) {
trace_ocfs2_extend_trans_restart(old_nblocks + nblocks);
- status = jbd2_journal_restart(handle,
- old_nblocks + nblocks);
+ status = jbd2_journal_restart(handle, old_nblocks + nblocks,
+ JBD2_NO_FAIL);
if (status < 0) {
mlog_errno(status);
goto bail;
diff --git a/include/linux/jbd2.h b/include/linux/jbd2.h
index 4ecb7b1..c11181b 100644
--- a/include/linux/jbd2.h
+++ b/include/linux/jbd2.h
@@ -1106,10 +1106,10 @@ static inline handle_t *journal_current_handle(void)
* 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_mask);
+extern handle_t *jbd2_journal_start(journal_t *,
+ int nblocks, int jbd_alloc_flags);
+extern int jbd2_journal_restart(handle_t *,
+ int nblocks, int jbd_alloc_flags);
extern int jbd2_journal_extend (handle_t *, int nblocks);
extern int jbd2_journal_get_write_access(handle_t *, struct buffer_head *);
extern int jbd2_journal_get_create_access (handle_t *, struct buffer_head *);
@@ -1322,6 +1322,11 @@ static inline int jbd_space_needed(journal_t *journal)
extern int jbd_blocks_per_page(struct inode *inode);
+/* JBD2 transaction allocation flags */
+#define JBD2_NO_FAIL 0x00000001
+#define JBD2_FAIL_OK 0x00000002
+#define JBD2_TOPLEVEL 0x00000004
+
#ifdef __KERNEL__
#define buffer_trace_init(bh) do {} while (0)
--
1.7.4.1
--
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