From: Ronnie Sahlberg lsahlber@redhat.com
[ Upstream commit 488968a8945c119859d91bb6a8dc13bf50002f15 ]
Remove the conditional checking for out_data_len and skipping the fallocate if it is 0. This is wrong will actually change any legitimate the fallocate where the entire region is unallocated into a no-op.
Additionally, before allocating the range, if FALLOC_FL_KEEP_SIZE is set then we need to clamp the length of the fallocate region as to not extend the size of the file.
Fixes: 966a3cb7c7db ("cifs: improve fallocate emulation") Signed-off-by: Ronnie Sahlberg lsahlber@redhat.com Signed-off-by: Steve French stfrench@microsoft.com Signed-off-by: Sasha Levin sashal@kernel.org --- fs/cifs/smb2ops.c | 23 ++++++++++++++++++----- 1 file changed, 18 insertions(+), 5 deletions(-)
diff --git a/fs/cifs/smb2ops.c b/fs/cifs/smb2ops.c index 442bf422aa01..b0b06eb86edf 100644 --- a/fs/cifs/smb2ops.c +++ b/fs/cifs/smb2ops.c @@ -3516,11 +3516,6 @@ static int smb3_simple_fallocate_range(unsigned int xid, (char **)&out_data, &out_data_len); if (rc) goto out; - /* - * It is already all allocated - */ - if (out_data_len == 0) - goto out;
buf = kzalloc(1024 * 1024, GFP_KERNEL); if (buf == NULL) { @@ -3643,6 +3638,24 @@ static long smb3_simple_falloc(struct file *file, struct cifs_tcon *tcon, goto out; }
+ if (keep_size == true) { + /* + * We can not preallocate pages beyond the end of the file + * in SMB2 + */ + if (off >= i_size_read(inode)) { + rc = 0; + goto out; + } + /* + * For fallocates that are partially beyond the end of file, + * clamp len so we only fallocate up to the end of file. + */ + if (off + len > i_size_read(inode)) { + len = i_size_read(inode) - off; + } + } + if ((keep_size == true) || (i_size_read(inode) >= off + len)) { /* * At this point, we are trying to fallocate an internal