The patch below does not apply to the 4.19-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.
Thanks, Sasha
------------------ original commit in Linus's tree ------------------
From 34cd86b6632718b7df3999d96f51e63de41c5e4f Mon Sep 17 00:00:00 2001 From: Marios Makassikis mmakassikis@freebox.fr Date: Thu, 22 Feb 2024 10:58:21 +0100 Subject: [PATCH] ksmbd: retrieve number of blocks using vfs_getattr in set_file_allocation_info
Use vfs_getattr() to retrieve stat information, rather than make assumptions about how a filesystem fills inode structs.
Cc: stable@vger.kernel.org Signed-off-by: Marios Makassikis mmakassikis@freebox.fr Acked-by: Namjae Jeon linkinjeon@kernel.org Signed-off-by: Steve French stfrench@microsoft.com --- fs/smb/server/smb2pdu.c | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-)
diff --git a/fs/smb/server/smb2pdu.c b/fs/smb/server/smb2pdu.c index f6cc5d2730ffb..199c31c275e5b 100644 --- a/fs/smb/server/smb2pdu.c +++ b/fs/smb/server/smb2pdu.c @@ -5809,15 +5809,21 @@ static int set_file_allocation_info(struct ksmbd_work *work,
loff_t alloc_blks; struct inode *inode; + struct kstat stat; int rc;
if (!(fp->daccess & FILE_WRITE_DATA_LE)) return -EACCES;
+ rc = vfs_getattr(&fp->filp->f_path, &stat, STATX_BASIC_STATS, + AT_STATX_SYNC_AS_STAT); + if (rc) + return rc; + alloc_blks = (le64_to_cpu(file_alloc_info->AllocationSize) + 511) >> 9; inode = file_inode(fp->filp);
- if (alloc_blks > inode->i_blocks) { + if (alloc_blks > stat.blocks) { smb_break_all_levII_oplock(work, fp, 1); rc = vfs_fallocate(fp->filp, FALLOC_FL_KEEP_SIZE, 0, alloc_blks * 512); @@ -5825,7 +5831,7 @@ static int set_file_allocation_info(struct ksmbd_work *work, pr_err("vfs_fallocate is failed : %d\n", rc); return rc; } - } else if (alloc_blks < inode->i_blocks) { + } else if (alloc_blks < stat.blocks) { loff_t size;
/*