* [RFC PATCH] vfs: export lseek_execute() to modules
@ 2013-06-24 11:52 ` Jeff Liu
0 siblings, 0 replies; 5+ messages in thread
From: Jeff Liu @ 2013-06-24 11:52 UTC (permalink / raw)
To: linux-fsdevel; +Cc: linux-mm
From: Jie Liu <jeff.liu@oracle.com>
For those file systems(btrfs/ext4/xfs/ocfs2/tmpfs) that support
SEEK_DATA/SEEK_HOLE functions, we end up handling the similar
matter in lseek_execute() to verify the final offset.
To reduce the duplications, this patch make lseek_execute() public
accessible so that we can call it directly from them.
Thanks Dave Chinner for this suggestion.
Signed-off-by: Jie Liu <jeff.liu@oracle.com>
Cc: Dave Chinner <dchinner@redhat.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Chris Mason <chris.mason@fusionio.com>
Cc: Josef Bacik <jbacik@fusionio.com>
Cc: Ben Myers <bpm@sgi.com>
Cc: Ted Tso <tytso@mit.edu>
Cc: Hugh Dickins <hughd@google.com>
Cc: Mark Fasheh <mfasheh@suse.com>
Cc: Joel Becker <jlbec@evilplan.org>
---
fs/btrfs/file.c | 15 +--------------
fs/ext4/file.c | 24 ++----------------------
fs/ocfs2/file.c | 12 +-----------
fs/read_write.c | 5 +++--
fs/xfs/xfs_file.c | 6 ++----
include/linux/fs.h | 2 ++
mm/shmem.c | 5 +----
7 files changed, 12 insertions(+), 57 deletions(-)
diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c
index 4205ba7..a56eced 100644
--- a/fs/btrfs/file.c
+++ b/fs/btrfs/file.c
@@ -2425,20 +2425,7 @@ static loff_t btrfs_file_llseek(struct file *file, loff_t offset, int whence)
}
}
- if (offset < 0 && !(file->f_mode & FMODE_UNSIGNED_OFFSET)) {
- offset = -EINVAL;
- goto out;
- }
- if (offset > inode->i_sb->s_maxbytes) {
- offset = -EINVAL;
- goto out;
- }
-
- /* Special lock needed here? */
- if (offset != file->f_pos) {
- file->f_pos = offset;
- file->f_version = 0;
- }
+ offset = lseek_execute(file, inode, offset, inode->i_sb->s_maxbytes);
out:
mutex_unlock(&inode->i_mutex);
return offset;
diff --git a/fs/ext4/file.c b/fs/ext4/file.c
index b1b4d51..f4b6971 100644
--- a/fs/ext4/file.c
+++ b/fs/ext4/file.c
@@ -494,17 +494,7 @@ static loff_t ext4_seek_data(struct file *file, loff_t offset, loff_t maxsize)
if (dataoff > isize)
return -ENXIO;
- if (dataoff < 0 && !(file->f_mode & FMODE_UNSIGNED_OFFSET))
- return -EINVAL;
- if (dataoff > maxsize)
- return -EINVAL;
-
- if (dataoff != file->f_pos) {
- file->f_pos = dataoff;
- file->f_version = 0;
- }
-
- return dataoff;
+ return lseek_execute(file, inode, dataoff, maxsize);
}
/*
@@ -580,17 +570,7 @@ static loff_t ext4_seek_hole(struct file *file, loff_t offset, loff_t maxsize)
if (holeoff > isize)
holeoff = isize;
- if (holeoff < 0 && !(file->f_mode & FMODE_UNSIGNED_OFFSET))
- return -EINVAL;
- if (holeoff > maxsize)
- return -EINVAL;
-
- if (holeoff != file->f_pos) {
- file->f_pos = holeoff;
- file->f_version = 0;
- }
-
- return holeoff;
+ return lseek_execute(file, inode, holeoff, maxsize);
}
/*
diff --git a/fs/ocfs2/file.c b/fs/ocfs2/file.c
index ff54014..13af684 100644
--- a/fs/ocfs2/file.c
+++ b/fs/ocfs2/file.c
@@ -2646,17 +2646,7 @@ static loff_t ocfs2_file_llseek(struct file *file, loff_t offset, int whence)
goto out;
}
- if (offset < 0 && !(file->f_mode & FMODE_UNSIGNED_OFFSET))
- ret = -EINVAL;
- if (!ret && offset > inode->i_sb->s_maxbytes)
- ret = -EINVAL;
- if (ret)
- goto out;
-
- if (offset != file->f_pos) {
- file->f_pos = offset;
- file->f_version = 0;
- }
+ offset = lseek_execute(file, inode, offset, inode->i_sb->s_maxbytes);
out:
mutex_unlock(&inode->i_mutex);
diff --git a/fs/read_write.c b/fs/read_write.c
index 2cefa41..5900bda3 100644
--- a/fs/read_write.c
+++ b/fs/read_write.c
@@ -41,8 +41,8 @@ static inline int unsigned_offsets(struct file *file)
return file->f_mode & FMODE_UNSIGNED_OFFSET;
}
-static loff_t lseek_execute(struct file *file, struct inode *inode,
- loff_t offset, loff_t maxsize)
+loff_t lseek_execute(struct file *file, struct inode *inode,
+ loff_t offset, loff_t maxsize)
{
if (offset < 0 && !unsigned_offsets(file))
return -EINVAL;
@@ -55,6 +55,7 @@ static loff_t lseek_execute(struct file *file, struct inode *inode,
}
return offset;
}
+EXPORT_SYMBOL(lseek_execute);
/**
* generic_file_llseek_size - generic llseek implementation for regular files
diff --git a/fs/xfs/xfs_file.c b/fs/xfs/xfs_file.c
index a5f2042..d052e88 100644
--- a/fs/xfs/xfs_file.c
+++ b/fs/xfs/xfs_file.c
@@ -1270,8 +1270,7 @@ xfs_seek_data(
}
out:
- if (offset != file->f_pos)
- file->f_pos = offset;
+ offset = lseek_execute(file, inode, offset, inode->i_sb->s_maxbytes);
out_unlock:
xfs_iunlock_map_shared(ip, lock);
@@ -1379,8 +1378,7 @@ out:
* situation in particular.
*/
offset = min_t(loff_t, offset, isize);
- if (offset != file->f_pos)
- file->f_pos = offset;
+ offset = lseek_execute(file, inode, offset, inode->i_sb->s_maxbytes);
out_unlock:
xfs_iunlock_map_shared(ip, lock);
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 65c2be2..00becde 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -2419,6 +2419,8 @@ extern void
file_ra_state_init(struct file_ra_state *ra, struct address_space *mapping);
extern loff_t noop_llseek(struct file *file, loff_t offset, int whence);
extern loff_t no_llseek(struct file *file, loff_t offset, int whence);
+extern loff_t lseek_execute(struct file *file, struct inode *inode,
+ loff_t offset, loff_t maxsize);
extern loff_t generic_file_llseek(struct file *file, loff_t offset, int whence);
extern loff_t generic_file_llseek_size(struct file *file, loff_t offset,
int whence, loff_t maxsize, loff_t eof);
diff --git a/mm/shmem.c b/mm/shmem.c
index 5e6a842..47ffb4a 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -1798,10 +1798,7 @@ static loff_t shmem_file_llseek(struct file *file, loff_t offset, int whence)
}
}
- if (offset >= 0 && offset != file->f_pos) {
- file->f_pos = offset;
- file->f_version = 0;
- }
+ offset = lseek_execute(file, inode, offset, MAX_LFS_FILESIZE);
mutex_unlock(&inode->i_mutex);
return offset;
}
--
1.7.9.5
^ permalink raw reply related [flat|nested] 5+ messages in thread
* [RFC PATCH] vfs: export lseek_execute() to modules
@ 2013-06-24 11:52 ` Jeff Liu
0 siblings, 0 replies; 5+ messages in thread
From: Jeff Liu @ 2013-06-24 11:52 UTC (permalink / raw)
To: linux-fsdevel; +Cc: linux-mm
From: Jie Liu <jeff.liu@oracle.com>
For those file systems(btrfs/ext4/xfs/ocfs2/tmpfs) that support
SEEK_DATA/SEEK_HOLE functions, we end up handling the similar
matter in lseek_execute() to verify the final offset.
To reduce the duplications, this patch make lseek_execute() public
accessible so that we can call it directly from them.
Thanks Dave Chinner for this suggestion.
Signed-off-by: Jie Liu <jeff.liu@oracle.com>
Cc: Dave Chinner <dchinner@redhat.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Chris Mason <chris.mason@fusionio.com>
Cc: Josef Bacik <jbacik@fusionio.com>
Cc: Ben Myers <bpm@sgi.com>
Cc: Ted Tso <tytso@mit.edu>
Cc: Hugh Dickins <hughd@google.com>
Cc: Mark Fasheh <mfasheh@suse.com>
Cc: Joel Becker <jlbec@evilplan.org>
---
fs/btrfs/file.c | 15 +--------------
fs/ext4/file.c | 24 ++----------------------
fs/ocfs2/file.c | 12 +-----------
fs/read_write.c | 5 +++--
fs/xfs/xfs_file.c | 6 ++----
include/linux/fs.h | 2 ++
mm/shmem.c | 5 +----
7 files changed, 12 insertions(+), 57 deletions(-)
diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c
index 4205ba7..a56eced 100644
--- a/fs/btrfs/file.c
+++ b/fs/btrfs/file.c
@@ -2425,20 +2425,7 @@ static loff_t btrfs_file_llseek(struct file *file, loff_t offset, int whence)
}
}
- if (offset < 0 && !(file->f_mode & FMODE_UNSIGNED_OFFSET)) {
- offset = -EINVAL;
- goto out;
- }
- if (offset > inode->i_sb->s_maxbytes) {
- offset = -EINVAL;
- goto out;
- }
-
- /* Special lock needed here? */
- if (offset != file->f_pos) {
- file->f_pos = offset;
- file->f_version = 0;
- }
+ offset = lseek_execute(file, inode, offset, inode->i_sb->s_maxbytes);
out:
mutex_unlock(&inode->i_mutex);
return offset;
diff --git a/fs/ext4/file.c b/fs/ext4/file.c
index b1b4d51..f4b6971 100644
--- a/fs/ext4/file.c
+++ b/fs/ext4/file.c
@@ -494,17 +494,7 @@ static loff_t ext4_seek_data(struct file *file, loff_t offset, loff_t maxsize)
if (dataoff > isize)
return -ENXIO;
- if (dataoff < 0 && !(file->f_mode & FMODE_UNSIGNED_OFFSET))
- return -EINVAL;
- if (dataoff > maxsize)
- return -EINVAL;
-
- if (dataoff != file->f_pos) {
- file->f_pos = dataoff;
- file->f_version = 0;
- }
-
- return dataoff;
+ return lseek_execute(file, inode, dataoff, maxsize);
}
/*
@@ -580,17 +570,7 @@ static loff_t ext4_seek_hole(struct file *file, loff_t offset, loff_t maxsize)
if (holeoff > isize)
holeoff = isize;
- if (holeoff < 0 && !(file->f_mode & FMODE_UNSIGNED_OFFSET))
- return -EINVAL;
- if (holeoff > maxsize)
- return -EINVAL;
-
- if (holeoff != file->f_pos) {
- file->f_pos = holeoff;
- file->f_version = 0;
- }
-
- return holeoff;
+ return lseek_execute(file, inode, holeoff, maxsize);
}
/*
diff --git a/fs/ocfs2/file.c b/fs/ocfs2/file.c
index ff54014..13af684 100644
--- a/fs/ocfs2/file.c
+++ b/fs/ocfs2/file.c
@@ -2646,17 +2646,7 @@ static loff_t ocfs2_file_llseek(struct file *file, loff_t offset, int whence)
goto out;
}
- if (offset < 0 && !(file->f_mode & FMODE_UNSIGNED_OFFSET))
- ret = -EINVAL;
- if (!ret && offset > inode->i_sb->s_maxbytes)
- ret = -EINVAL;
- if (ret)
- goto out;
-
- if (offset != file->f_pos) {
- file->f_pos = offset;
- file->f_version = 0;
- }
+ offset = lseek_execute(file, inode, offset, inode->i_sb->s_maxbytes);
out:
mutex_unlock(&inode->i_mutex);
diff --git a/fs/read_write.c b/fs/read_write.c
index 2cefa41..5900bda3 100644
--- a/fs/read_write.c
+++ b/fs/read_write.c
@@ -41,8 +41,8 @@ static inline int unsigned_offsets(struct file *file)
return file->f_mode & FMODE_UNSIGNED_OFFSET;
}
-static loff_t lseek_execute(struct file *file, struct inode *inode,
- loff_t offset, loff_t maxsize)
+loff_t lseek_execute(struct file *file, struct inode *inode,
+ loff_t offset, loff_t maxsize)
{
if (offset < 0 && !unsigned_offsets(file))
return -EINVAL;
@@ -55,6 +55,7 @@ static loff_t lseek_execute(struct file *file, struct inode *inode,
}
return offset;
}
+EXPORT_SYMBOL(lseek_execute);
/**
* generic_file_llseek_size - generic llseek implementation for regular files
diff --git a/fs/xfs/xfs_file.c b/fs/xfs/xfs_file.c
index a5f2042..d052e88 100644
--- a/fs/xfs/xfs_file.c
+++ b/fs/xfs/xfs_file.c
@@ -1270,8 +1270,7 @@ xfs_seek_data(
}
out:
- if (offset != file->f_pos)
- file->f_pos = offset;
+ offset = lseek_execute(file, inode, offset, inode->i_sb->s_maxbytes);
out_unlock:
xfs_iunlock_map_shared(ip, lock);
@@ -1379,8 +1378,7 @@ out:
* situation in particular.
*/
offset = min_t(loff_t, offset, isize);
- if (offset != file->f_pos)
- file->f_pos = offset;
+ offset = lseek_execute(file, inode, offset, inode->i_sb->s_maxbytes);
out_unlock:
xfs_iunlock_map_shared(ip, lock);
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 65c2be2..00becde 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -2419,6 +2419,8 @@ extern void
file_ra_state_init(struct file_ra_state *ra, struct address_space *mapping);
extern loff_t noop_llseek(struct file *file, loff_t offset, int whence);
extern loff_t no_llseek(struct file *file, loff_t offset, int whence);
+extern loff_t lseek_execute(struct file *file, struct inode *inode,
+ loff_t offset, loff_t maxsize);
extern loff_t generic_file_llseek(struct file *file, loff_t offset, int whence);
extern loff_t generic_file_llseek_size(struct file *file, loff_t offset,
int whence, loff_t maxsize, loff_t eof);
diff --git a/mm/shmem.c b/mm/shmem.c
index 5e6a842..47ffb4a 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -1798,10 +1798,7 @@ static loff_t shmem_file_llseek(struct file *file, loff_t offset, int whence)
}
}
- if (offset >= 0 && offset != file->f_pos) {
- file->f_pos = offset;
- file->f_version = 0;
- }
+ offset = lseek_execute(file, inode, offset, MAX_LFS_FILESIZE);
mutex_unlock(&inode->i_mutex);
return offset;
}
--
1.7.9.5
--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@kvack.org. For more info on Linux MM,
see: http://www.linux-mm.org/ .
Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>
^ permalink raw reply related [flat|nested] 5+ messages in thread
* Re: [RFC PATCH] vfs: export lseek_execute() to modules
2013-06-24 11:52 ` Jeff Liu
@ 2013-06-24 12:55 ` Christoph Hellwig
-1 siblings, 0 replies; 5+ messages in thread
From: Christoph Hellwig @ 2013-06-24 12:55 UTC (permalink / raw)
To: Jeff Liu; +Cc: linux-fsdevel, linux-mm
On Mon, Jun 24, 2013 at 07:52:24PM +0800, Jeff Liu wrote:
> From: Jie Liu <jeff.liu@oracle.com>
>
> For those file systems(btrfs/ext4/xfs/ocfs2/tmpfs) that support
> SEEK_DATA/SEEK_HOLE functions, we end up handling the similar
> matter in lseek_execute() to verify the final offset.
>
> To reduce the duplications, this patch make lseek_execute() public
> accessible so that we can call it directly from them.
>
> Thanks Dave Chinner for this suggestion.
Please add a kerneldoc comment explaining the use of this function.
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [RFC PATCH] vfs: export lseek_execute() to modules
@ 2013-06-24 12:55 ` Christoph Hellwig
0 siblings, 0 replies; 5+ messages in thread
From: Christoph Hellwig @ 2013-06-24 12:55 UTC (permalink / raw)
To: Jeff Liu; +Cc: linux-fsdevel, linux-mm
On Mon, Jun 24, 2013 at 07:52:24PM +0800, Jeff Liu wrote:
> From: Jie Liu <jeff.liu@oracle.com>
>
> For those file systems(btrfs/ext4/xfs/ocfs2/tmpfs) that support
> SEEK_DATA/SEEK_HOLE functions, we end up handling the similar
> matter in lseek_execute() to verify the final offset.
>
> To reduce the duplications, this patch make lseek_execute() public
> accessible so that we can call it directly from them.
>
> Thanks Dave Chinner for this suggestion.
Please add a kerneldoc comment explaining the use of this function.
--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@kvack.org. For more info on Linux MM,
see: http://www.linux-mm.org/ .
Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [RFC PATCH] vfs: export lseek_execute() to modules
2013-06-24 12:55 ` Christoph Hellwig
(?)
@ 2013-06-25 2:30 ` Jeff Liu
-1 siblings, 0 replies; 5+ messages in thread
From: Jeff Liu @ 2013-06-25 2:30 UTC (permalink / raw)
To: Christoph Hellwig; +Cc: linux-fsdevel, linux-mm
On 06/24/2013 08:55 PM, Christoph Hellwig wrote:
> On Mon, Jun 24, 2013 at 07:52:24PM +0800, Jeff Liu wrote:
>> From: Jie Liu <jeff.liu@oracle.com>
>>
>> For those file systems(btrfs/ext4/xfs/ocfs2/tmpfs) that support
>> SEEK_DATA/SEEK_HOLE functions, we end up handling the similar
>> matter in lseek_execute() to verify the final offset.
>>
>> To reduce the duplications, this patch make lseek_execute() public
>> accessible so that we can call it directly from them.
>>
>> Thanks Dave Chinner for this suggestion.
>
> Please add a kerneldoc comment explaining the use of this function.
Ok, I'll repost it later.
Thanks,
-Jeff
--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@kvack.org. For more info on Linux MM,
see: http://www.linux-mm.org/ .
Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>
^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2013-06-25 2:30 UTC | newest]
Thread overview: 5+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2013-06-24 11:52 [RFC PATCH] vfs: export lseek_execute() to modules Jeff Liu
2013-06-24 11:52 ` Jeff Liu
2013-06-24 12:55 ` Christoph Hellwig
2013-06-24 12:55 ` Christoph Hellwig
2013-06-25 2:30 ` Jeff Liu
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.