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Date: Fri, 31 May 2013 11:42:43 +0200
From: Jan Kara <jack@...e.cz>
To: Ted Tso <tytso@....edu>
Cc: linux-ext4@...r.kernel.org, Jan Kara <jack@...e.cz>
Subject: [PATCH 10/26] ext4: Provide wrappers for transaction reservation calls
Reviewed-by: Zheng Liu <wenqing.lz@...bao.com>
Signed-off-by: Jan Kara <jack@...e.cz>
---
fs/ext4/ext4_jbd2.c | 58 ++++++++++++++++++++++++++++++++++++---------
fs/ext4/ext4_jbd2.h | 26 ++++++++++++++++----
fs/ext4/ialloc.c | 3 ++-
include/trace/events/ext4.h | 41 +++++++++++++++++++++++++-------
4 files changed, 103 insertions(+), 25 deletions(-)
diff --git a/fs/ext4/ext4_jbd2.c b/fs/ext4/ext4_jbd2.c
index bd25e78..72a3600 100644
--- a/fs/ext4/ext4_jbd2.c
+++ b/fs/ext4/ext4_jbd2.c
@@ -38,31 +38,43 @@ static void ext4_put_nojournal(handle_t *handle)
/*
* Wrappers for jbd2_journal_start/end.
*/
-handle_t *__ext4_journal_start_sb(struct super_block *sb, unsigned int line,
- int type, int nblocks)
+static int ext4_journal_check_start(struct super_block *sb)
{
journal_t *journal;
might_sleep();
-
- trace_ext4_journal_start(sb, nblocks, _RET_IP_);
if (sb->s_flags & MS_RDONLY)
- return ERR_PTR(-EROFS);
-
+ return -EROFS;
WARN_ON(sb->s_writers.frozen == SB_FREEZE_COMPLETE);
journal = EXT4_SB(sb)->s_journal;
- if (!journal)
- return ext4_get_nojournal();
/*
* Special case here: if the journal has aborted behind our
* backs (eg. EIO in the commit thread), then we still need to
* take the FS itself readonly cleanly.
*/
- if (is_journal_aborted(journal)) {
+ if (journal && is_journal_aborted(journal)) {
ext4_abort(sb, "Detected aborted journal");
- return ERR_PTR(-EROFS);
+ return -EROFS;
}
- return jbd2__journal_start(journal, nblocks, 0, GFP_NOFS, type, line);
+ return 0;
+}
+
+handle_t *__ext4_journal_start_sb(struct super_block *sb, unsigned int line,
+ int type, int blocks, int rsv_blocks)
+{
+ journal_t *journal;
+ int err;
+
+ trace_ext4_journal_start(sb, blocks, rsv_blocks, _RET_IP_);
+ err = ext4_journal_check_start(sb);
+ if (err < 0)
+ return ERR_PTR(err);
+
+ journal = EXT4_SB(sb)->s_journal;
+ if (!journal)
+ return ext4_get_nojournal();
+ return jbd2__journal_start(journal, blocks, rsv_blocks, GFP_NOFS,
+ type, line);
}
int __ext4_journal_stop(const char *where, unsigned int line, handle_t *handle)
@@ -86,6 +98,30 @@ int __ext4_journal_stop(const char *where, unsigned int line, handle_t *handle)
return err;
}
+handle_t *__ext4_journal_start_reserved(handle_t *handle, unsigned int line,
+ int type)
+{
+ struct super_block *sb;
+ int err;
+
+ if (!ext4_handle_valid(handle))
+ return ext4_get_nojournal();
+
+ sb = handle->h_journal->j_private;
+ trace_ext4_journal_start_reserved(sb, handle->h_buffer_credits,
+ _RET_IP_);
+ err = ext4_journal_check_start(sb);
+ if (err < 0) {
+ jbd2_journal_free_reserved(handle);
+ return ERR_PTR(err);
+ }
+
+ err = jbd2_journal_start_reserved(handle, type, line);
+ if (err < 0)
+ return ERR_PTR(err);
+ return handle;
+}
+
void ext4_journal_abort_handle(const char *caller, unsigned int line,
const char *err_fn, struct buffer_head *bh,
handle_t *handle, int err)
diff --git a/fs/ext4/ext4_jbd2.h b/fs/ext4/ext4_jbd2.h
index c8c6885..fdd865e 100644
--- a/fs/ext4/ext4_jbd2.h
+++ b/fs/ext4/ext4_jbd2.h
@@ -265,7 +265,7 @@ int __ext4_handle_dirty_super(const char *where, unsigned int line,
__ext4_handle_dirty_super(__func__, __LINE__, (handle), (sb))
handle_t *__ext4_journal_start_sb(struct super_block *sb, unsigned int line,
- int type, int nblocks);
+ int type, int blocks, int rsv_blocks);
int __ext4_journal_stop(const char *where, unsigned int line, handle_t *handle);
#define EXT4_NOJOURNAL_MAX_REF_COUNT ((unsigned long) 4096)
@@ -300,21 +300,37 @@ static inline int ext4_handle_has_enough_credits(handle_t *handle, int needed)
}
#define ext4_journal_start_sb(sb, type, nblocks) \
- __ext4_journal_start_sb((sb), __LINE__, (type), (nblocks))
+ __ext4_journal_start_sb((sb), __LINE__, (type), (nblocks), 0)
#define ext4_journal_start(inode, type, nblocks) \
- __ext4_journal_start((inode), __LINE__, (type), (nblocks))
+ __ext4_journal_start((inode), __LINE__, (type), (nblocks), 0)
+
+#define ext4_journal_start_with_reserve(inode, type, blocks, rsv_blocks) \
+ __ext4_journal_start((inode), __LINE__, (type), (blocks), (rsv_blocks))
static inline handle_t *__ext4_journal_start(struct inode *inode,
unsigned int line, int type,
- int nblocks)
+ int blocks, int rsv_blocks)
{
- return __ext4_journal_start_sb(inode->i_sb, line, type, nblocks);
+ return __ext4_journal_start_sb(inode->i_sb, line, type, blocks,
+ rsv_blocks);
}
#define ext4_journal_stop(handle) \
__ext4_journal_stop(__func__, __LINE__, (handle))
+#define ext4_journal_start_reserve(handle, type) \
+ __ext4_journal_start_reserved((handle), __LINE__, (type))
+
+handle_t *__ext4_journal_start_reserved(handle_t *handle, unsigned int line,
+ int type);
+
+static inline void ext4_journal_free_reserved(handle_t *handle)
+{
+ if (ext4_handle_valid(handle))
+ jbd2_journal_free_reserved(handle);
+}
+
static inline handle_t *ext4_journal_current_handle(void)
{
return journal_current_handle();
diff --git a/fs/ext4/ialloc.c b/fs/ext4/ialloc.c
index 00a818d..f03598c 100644
--- a/fs/ext4/ialloc.c
+++ b/fs/ext4/ialloc.c
@@ -747,7 +747,8 @@ repeat_in_this_group:
if (!handle) {
BUG_ON(nblocks <= 0);
handle = __ext4_journal_start_sb(dir->i_sb, line_no,
- handle_type, nblocks);
+ handle_type, nblocks,
+ 0);
if (IS_ERR(handle)) {
err = PTR_ERR(handle);
ext4_std_error(sb, err);
diff --git a/include/trace/events/ext4.h b/include/trace/events/ext4.h
index 8ee15b9..e0f3c63 100644
--- a/include/trace/events/ext4.h
+++ b/include/trace/events/ext4.h
@@ -1638,25 +1638,50 @@ TRACE_EVENT(ext4_load_inode,
);
TRACE_EVENT(ext4_journal_start,
- TP_PROTO(struct super_block *sb, int nblocks, unsigned long IP),
+ TP_PROTO(struct super_block *sb, int blocks, int rsv_blocks,
+ unsigned long IP),
- TP_ARGS(sb, nblocks, IP),
+ TP_ARGS(sb, blocks, rsv_blocks, IP),
TP_STRUCT__entry(
__field( dev_t, dev )
__field(unsigned long, ip )
- __field( int, nblocks )
+ __field( int, blocks )
+ __field( int, rsv_blocks )
),
TP_fast_assign(
- __entry->dev = sb->s_dev;
- __entry->ip = IP;
- __entry->nblocks = nblocks;
+ __entry->dev = sb->s_dev;
+ __entry->ip = IP;
+ __entry->blocks = blocks;
+ __entry->rsv_blocks = rsv_blocks;
),
- TP_printk("dev %d,%d nblocks %d caller %pF",
+ TP_printk("dev %d,%d blocks, %d rsv_blocks, %d caller %pF",
MAJOR(__entry->dev), MINOR(__entry->dev),
- __entry->nblocks, (void *)__entry->ip)
+ __entry->blocks, __entry->rsv_blocks, (void *)__entry->ip)
+);
+
+TRACE_EVENT(ext4_journal_start_reserved,
+ TP_PROTO(struct super_block *sb, int blocks, unsigned long IP),
+
+ TP_ARGS(sb, blocks, IP),
+
+ TP_STRUCT__entry(
+ __field( dev_t, dev )
+ __field(unsigned long, ip )
+ __field( int, blocks )
+ ),
+
+ TP_fast_assign(
+ __entry->dev = sb->s_dev;
+ __entry->ip = IP;
+ __entry->blocks = blocks;
+ ),
+
+ TP_printk("dev %d,%d blocks, %d caller %pF",
+ MAJOR(__entry->dev), MINOR(__entry->dev),
+ __entry->blocks, (void *)__entry->ip)
);
DECLARE_EVENT_CLASS(ext4__trim,
--
1.8.1.4
--
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