The patch titled
mm: move common segment checks to separate helper function
has been removed from the -mm tree. Its filename was
mm-move-common-segment-checks-to-separate-helper-function-v7.patch
This patch was dropped because it was merged into mainline or a subsystem tree
------------------------------------------------------
Subject: mm: move common segment checks to separate helper function
From: Dmitriy Monakhov <dmonakhov@xxxxxxxxxx>
[akpm@xxxxxxxxxxxxxxxxxxxx: cleanup]
Signed-off-by: Monakhov Dmitriy <dmonakhov@xxxxxxxxxx>
Cc: Christoph Hellwig <hch@xxxxxx>
Acked-by: Anton Altaparmakov <aia21@xxxxxxxxx>
Acked-by: David Chinner <dgc@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
fs/ntfs/file.c | 21 +-------
fs/xfs/linux-2.6/xfs_lrw.c | 22 +--------
include/linux/fs.h | 2
mm/filemap.c | 82 +++++++++++++++++++----------------
4 files changed, 53 insertions(+), 74 deletions(-)
diff -puN fs/ntfs/file.c~mm-move-common-segment-checks-to-separate-helper-function-v7 fs/ntfs/file.c
--- a/fs/ntfs/file.c~mm-move-common-segment-checks-to-separate-helper-function-v7
+++ a/fs/ntfs/file.c
@@ -2129,28 +2129,13 @@ static ssize_t ntfs_file_aio_write_noloc
struct address_space *mapping = file->f_mapping;
struct inode *inode = mapping->host;
loff_t pos;
- unsigned long seg;
size_t count; /* after file limit checks */
ssize_t written, err;
count = 0;
- for (seg = 0; seg < nr_segs; seg++) {
- const struct iovec *iv = &iov[seg];
- /*
- * If any segment has a negative length, or the cumulative
- * length ever wraps negative then return -EINVAL.
- */
- count += iv->iov_len;
- if (unlikely((ssize_t)(count|iv->iov_len) < 0))
- return -EINVAL;
- if (access_ok(VERIFY_READ, iv->iov_base, iv->iov_len))
- continue;
- if (!seg)
- return -EFAULT;
- nr_segs = seg;
- count -= iv->iov_len; /* This segment is no good */
- break;
- }
+ err = generic_segment_checks(iov, &nr_segs, &count, VERIFY_READ);
+ if (err)
+ return err;
pos = *ppos;
vfs_check_frozen(inode->i_sb, SB_FREEZE_WRITE);
/* We can write back this queue in page reclaim. */
diff -puN fs/xfs/linux-2.6/xfs_lrw.c~mm-move-common-segment-checks-to-separate-helper-function-v7 fs/xfs/linux-2.6/xfs_lrw.c
--- a/fs/xfs/linux-2.6/xfs_lrw.c~mm-move-common-segment-checks-to-separate-helper-function-v7
+++ a/fs/xfs/linux-2.6/xfs_lrw.c
@@ -639,7 +639,6 @@ xfs_write(
xfs_fsize_t isize, new_size;
xfs_iocore_t *io;
bhv_vnode_t *vp;
- unsigned long seg;
int iolock;
int eventsent = 0;
bhv_vrwlock_t locktype;
@@ -652,24 +651,9 @@ xfs_write(
vp = BHV_TO_VNODE(bdp);
xip = XFS_BHVTOI(bdp);
- for (seg = 0; seg < segs; seg++) {
- const struct iovec *iv = &iovp[seg];
-
- /*
- * If any segment has a negative length, or the cumulative
- * length ever wraps negative then return -EINVAL.
- */
- ocount += iv->iov_len;
- if (unlikely((ssize_t)(ocount|iv->iov_len) < 0))
- return -EINVAL;
- if (access_ok(VERIFY_READ, iv->iov_base, iv->iov_len))
- continue;
- if (seg == 0)
- return -EFAULT;
- segs = seg;
- ocount -= iv->iov_len; /* This segment is no good */
- break;
- }
+ error = generic_segment_checks(iovp, &segs, &ocount, VERIFY_READ);
+ if (error)
+ return error;
count = ocount;
pos = *offset;
diff -puN include/linux/fs.h~mm-move-common-segment-checks-to-separate-helper-function-v7 include/linux/fs.h
--- a/include/linux/fs.h~mm-move-common-segment-checks-to-separate-helper-function-v7
+++ a/include/linux/fs.h
@@ -1735,6 +1735,8 @@ extern ssize_t generic_file_sendfile(str
extern void do_generic_mapping_read(struct address_space *mapping,
struct file_ra_state *, struct file *,
loff_t *, read_descriptor_t *, read_actor_t);
+extern int generic_segment_checks(const struct iovec *iov,
+ unsigned long *nr_segs, size_t *count, int access_flags);
/* fs/splice.c */
extern ssize_t generic_file_splice_read(struct file *, loff_t *,
diff -puN mm/filemap.c~mm-move-common-segment-checks-to-separate-helper-function-v7 mm/filemap.c
--- a/mm/filemap.c~mm-move-common-segment-checks-to-separate-helper-function-v7
+++ a/mm/filemap.c
@@ -1110,6 +1110,45 @@ success:
return size;
}
+/*
+ * Performs necessary checks before doing a write
+ * @iov: io vector request
+ * @nr_segs: number of segments in the iovec
+ * @count: number of bytes to write
+ * @access_flags: type of access: %VERIFY_READ or %VERIFY_WRITE
+ *
+ * Adjust number of segments and amount of bytes to write (nr_segs should be
+ * properly initialized first). Returns appropriate error code that caller
+ * should return or zero in case that write should be allowed.
+ */
+int generic_segment_checks(const struct iovec *iov,
+ unsigned long *nr_segs, size_t *count, int access_flags)
+{
+ unsigned long seg;
+ size_t cnt = 0;
+ for (seg = 0; seg < *nr_segs; seg++) {
+ const struct iovec *iv = &iov[seg];
+
+ /*
+ * If any segment has a negative length, or the cumulative
+ * length ever wraps negative then return -EINVAL.
+ */
+ cnt += iv->iov_len;
+ if (unlikely((ssize_t)(cnt|iv->iov_len) < 0))
+ return -EINVAL;
+ if (access_ok(access_flags, iv->iov_base, iv->iov_len))
+ continue;
+ if (seg == 0)
+ return -EFAULT;
+ *nr_segs = seg;
+ cnt -= iv->iov_len; /* This segment is no good */
+ break;
+ }
+ *count = cnt;
+ return 0;
+}
+EXPORT_SYMBOL(generic_segment_checks);
+
/**
* generic_file_aio_read - generic filesystem read routine
* @iocb: kernel I/O control block
@@ -1131,24 +1170,9 @@ generic_file_aio_read(struct kiocb *iocb
loff_t *ppos = &iocb->ki_pos;
count = 0;
- for (seg = 0; seg < nr_segs; seg++) {
- const struct iovec *iv = &iov[seg];
-
- /*
- * If any segment has a negative length, or the cumulative
- * length ever wraps negative then return -EINVAL.
- */
- count += iv->iov_len;
- if (unlikely((ssize_t)(count|iv->iov_len) < 0))
- return -EINVAL;
- if (access_ok(VERIFY_WRITE, iv->iov_base, iv->iov_len))
- continue;
- if (seg == 0)
- return -EFAULT;
- nr_segs = seg;
- count -= iv->iov_len; /* This segment is no good */
- break;
- }
+ retval = generic_segment_checks(iov, &nr_segs, &count, VERIFY_WRITE);
+ if (retval)
+ return retval;
/* coalesce the iovecs and go direct-to-BIO for O_DIRECT */
if (filp->f_flags & O_DIRECT) {
@@ -2218,30 +2242,14 @@ __generic_file_aio_write_nolock(struct k
size_t ocount; /* original count */
size_t count; /* after file limit checks */
struct inode *inode = mapping->host;
- unsigned long seg;
loff_t pos;
ssize_t written;
ssize_t err;
ocount = 0;
- for (seg = 0; seg < nr_segs; seg++) {
- const struct iovec *iv = &iov[seg];
-
- /*
- * If any segment has a negative length, or the cumulative
- * length ever wraps negative then return -EINVAL.
- */
- ocount += iv->iov_len;
- if (unlikely((ssize_t)(ocount|iv->iov_len) < 0))
- return -EINVAL;
- if (access_ok(VERIFY_READ, iv->iov_base, iv->iov_len))
- continue;
- if (seg == 0)
- return -EFAULT;
- nr_segs = seg;
- ocount -= iv->iov_len; /* This segment is no good */
- break;
- }
+ err = generic_segment_checks(iov, &nr_segs, &ocount, VERIFY_READ);
+ if (err)
+ return err;
count = ocount;
pos = *ppos;
_
Patches currently in -mm which might be from dmonakhov@xxxxxxxxxx are
origin.patch
-
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