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ceph: stop copying to iter at EOF on sync reads

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If EOF is encountered, ceph_sync_read() return value is adjusted down
according to i_size, but the "to" iter is advanced by the actual number
of bytes read.  Then, when retrying, the remainder of the range may be
skipped incorrectly.

Ensure that the "to" iter is advanced only until EOF.

[ idryomov: changelog ]

Fixes: c3d8e0b5de ("ceph: return the real size read when it hits EOF")
Reported-by: Frank Hsiao <frankhsiao@qnap.com>
Signed-off-by: Xiubo Li <xiubli@redhat.com>
Reviewed-by: Ilya Dryomov <idryomov@gmail.com>
Tested-by: Frank Hsiao <frankhsiao@qnap.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
This commit is contained in:
Xiubo Li 2024-02-21 09:16:12 +08:00 committed by Ilya Dryomov
parent a8922f7967
commit 1065da21e5
1 changed files with 13 additions and 10 deletions
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9
fs/ceph/file.c
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@ -1138,7 +1138,12 @@ ssize_t __ceph_sync_read(struct inode *inode, loff_t *ki_pos,
}
idx = 0;
left = ret > 0 ? ret : 0;
if (ret <= 0)
left = 0;
else if (off + ret > i_size)
left = i_size - off;
else
left = ret;
while (left > 0) {
size_t plen, copied;
@ -1167,7 +1172,6 @@ ssize_t __ceph_sync_read(struct inode *inode, loff_t *ki_pos,
}
if (ret > 0) {
if (off > *ki_pos) {
if (off >= i_size) {
*retry_op = CHECK_EOF;
ret = i_size - *ki_pos;
@ -1176,7 +1180,6 @@ ssize_t __ceph_sync_read(struct inode *inode, loff_t *ki_pos,
ret = off - *ki_pos;
*ki_pos = off;
}
}
if (last_objver)
*last_objver = objver;