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ksmbd: retrieve number of blocks using vfs_getattr in set_file_allocation_info

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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>
This commit is contained in:
Marios Makassikis 2024-02-22 10:58:21 +01:00 committed by Steve French
parent 5614c8c487
commit 34cd86b663
1 changed files with 8 additions and 2 deletions
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10
fs/smb/server/smb2pdu.c
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@ -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;
/*