Linux CIFS filesystem development
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* [PATCH] cifs: truncate the inode and mapping when we simulate fcollapse
@ 2022-02-22  5:35 Ronnie Sahlberg
  2022-02-22 12:08 ` kernel test robot
  0 siblings, 1 reply; 4+ messages in thread
From: Ronnie Sahlberg @ 2022-02-22  5:35 UTC (permalink / raw)
  To: linux-cifs; +Cc: Steve French

RHBZ:1997367

When we collapse a range in smb3_collapse_range() we must make sure
we update the inode size and pagecache accordingly.

If not, both inode size and pagecahce may be stale until it is refreshed.

This can be demonstrated for the inode size by running :

xfs_io -i -f -c "truncate 320k" -c "fcollapse 64k 128k" -c "fiemap -v"  \
/mnt/testfile

where we can see the result of stale data in the fiemap output.
The third line of the output is wrong, all this data should be truncated.

 EXT: FILE-OFFSET      BLOCK-RANGE      TOTAL FLAGS
   0: [0..127]:        hole               128
   1: [128..383]:      128..383           256   0x1
   2: [384..639]:      hole               256

And the correct output, when the inode size has been updated correctly should
look like this:

 EXT: FILE-OFFSET      BLOCK-RANGE      TOTAL FLAGS
   0: [0..127]:        hole               128
   1: [128..383]:      128..383           256   0x1

Reported-by: Xiaoli Feng <xifeng@redhat.com>
Signed-off-by: Ronnie Sahlberg <lsahlber@redhat.com>
---
 fs/cifs/smb2ops.c | 19 +++++++++++++++----
 1 file changed, 15 insertions(+), 4 deletions(-)

diff --git a/fs/cifs/smb2ops.c b/fs/cifs/smb2ops.c
index af5d0830bc8a..5cd3247e71b9 100644
--- a/fs/cifs/smb2ops.c
+++ b/fs/cifs/smb2ops.c
@@ -25,6 +25,7 @@
 #include "smb2glob.h"
 #include "cifs_ioctl.h"
 #include "smbdirect.h"
+#include "fscache.h"
 #include "fs_context.h"
 
 /* Change credits for different ops and return the total number of credits */
@@ -3887,29 +3888,39 @@ static long smb3_collapse_range(struct file *file, struct cifs_tcon *tcon,
 {
 	int rc;
 	unsigned int xid;
+	struct inode *inode;
 	struct cifsFileInfo *cfile = file->private_data;
+	struct cifsInodeInfo *cifsi;
 	__le64 eof;
 
 	xid = get_xid();
 
-	if (off >= i_size_read(file->f_inode) ||
-	    off + len >= i_size_read(file->f_inode)) {
+	inode = d_inode(cfile->dentry);
+	cifsi = CIFS_I(inode);
+
+	if (off >= i_size_read(inode) ||
+	    off + len >= i_size_read(inode)) {
 		rc = -EINVAL;
 		goto out;
 	}
 
 	rc = smb2_copychunk_range(xid, cfile, cfile, off + len,
-				  i_size_read(file->f_inode) - off - len, off);
+				  i_size_read(inode) - off - len, off);
 	if (rc < 0)
 		goto out;
 
-	eof = cpu_to_le64(i_size_read(file->f_inode) - len);
+	eof = cpu_to_le64(i_size_read(inode) - len);
 	rc = SMB2_set_eof(xid, tcon, cfile->fid.persistent_fid,
 			  cfile->fid.volatile_fid, cfile->pid, &eof);
 	if (rc < 0)
 		goto out;
 
 	rc = 0;
+
+	eof = i_size_read(inode) - len;
+	cifsi->server_eof = eof;
+	truncate_setsize(inode, eof);
+	fscache_resize_cookie(cifs_inode_cookie(inode), eof);
  out:
 	free_xid(xid);
 	return rc;
-- 
2.30.2


^ permalink raw reply related	[flat|nested] 4+ messages in thread
* [PATCH] cifs: truncate the inode and mapping when we simulate fcollapse
@ 2022-02-23  1:14 Ronnie Sahlberg
  2022-02-23  2:44 ` Steve French
  0 siblings, 1 reply; 4+ messages in thread
From: Ronnie Sahlberg @ 2022-02-23  1:14 UTC (permalink / raw)
  To: linux-cifs; +Cc: Steve French

RHBZ:1997367

When we collapse a range in smb3_collapse_range() we must make sure
we update the inode size and pagecache accordingly.

If not, both inode size and pagecahce may be stale until it is refreshed.

This can be demonstrated for the inode size by running :

xfs_io -i -f -c "truncate 320k" -c "fcollapse 64k 128k" -c "fiemap -v"  \
/mnt/testfile

where we can see the result of stale data in the fiemap output.
The third line of the output is wrong, all this data should be truncated.

 EXT: FILE-OFFSET      BLOCK-RANGE      TOTAL FLAGS
   0: [0..127]:        hole               128
   1: [128..383]:      128..383           256   0x1
   2: [384..639]:      hole               256

And the correct output, when the inode size has been updated correctly should
look like this:

 EXT: FILE-OFFSET      BLOCK-RANGE      TOTAL FLAGS
   0: [0..127]:        hole               128
   1: [128..383]:      128..383           256   0x1

Reported-by: Xiaoli Feng <xifeng@redhat.com>
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Ronnie Sahlberg <lsahlber@redhat.com>
---
 fs/cifs/smb2ops.c | 18 ++++++++++++++----
 1 file changed, 14 insertions(+), 4 deletions(-)

diff --git a/fs/cifs/smb2ops.c b/fs/cifs/smb2ops.c
index af5d0830bc8a..891b11576e55 100644
--- a/fs/cifs/smb2ops.c
+++ b/fs/cifs/smb2ops.c
@@ -25,6 +25,7 @@
 #include "smb2glob.h"
 #include "cifs_ioctl.h"
 #include "smbdirect.h"
+#include "fscache.h"
 #include "fs_context.h"
 
 /* Change credits for different ops and return the total number of credits */
@@ -3887,29 +3888,38 @@ static long smb3_collapse_range(struct file *file, struct cifs_tcon *tcon,
 {
 	int rc;
 	unsigned int xid;
+	struct inode *inode;
 	struct cifsFileInfo *cfile = file->private_data;
+	struct cifsInodeInfo *cifsi;
 	__le64 eof;
 
 	xid = get_xid();
 
-	if (off >= i_size_read(file->f_inode) ||
-	    off + len >= i_size_read(file->f_inode)) {
+	inode = d_inode(cfile->dentry);
+	cifsi = CIFS_I(inode);
+
+	if (off >= i_size_read(inode) ||
+	    off + len >= i_size_read(inode)) {
 		rc = -EINVAL;
 		goto out;
 	}
 
 	rc = smb2_copychunk_range(xid, cfile, cfile, off + len,
-				  i_size_read(file->f_inode) - off - len, off);
+				  i_size_read(inode) - off - len, off);
 	if (rc < 0)
 		goto out;
 
-	eof = cpu_to_le64(i_size_read(file->f_inode) - len);
+	eof = cpu_to_le64(i_size_read(inode) - len);
 	rc = SMB2_set_eof(xid, tcon, cfile->fid.persistent_fid,
 			  cfile->fid.volatile_fid, cfile->pid, &eof);
 	if (rc < 0)
 		goto out;
 
 	rc = 0;
+
+	cifsi->server_eof = i_size_read(inode) - len;
+	truncate_setsize(inode, cifsi->server_eof);
+	fscache_resize_cookie(cifs_inode_cookie(inode), cifsi->server_eof);
  out:
 	free_xid(xid);
 	return rc;
-- 
2.30.2


^ permalink raw reply related	[flat|nested] 4+ messages in thread
end of thread, other threads:[~2022-02-23  2:46 UTC | newest]

Thread overview: 4+ messages (download: mbox.gz follow: Atom feed
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2022-02-22  5:35 [PATCH] cifs: truncate the inode and mapping when we simulate fcollapse Ronnie Sahlberg
2022-02-22 12:08 ` kernel test robot
  -- strict thread matches above, loose matches on Subject: below --
2022-02-23  1:14 Ronnie Sahlberg
2022-02-23  2:44 ` Steve French

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