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Hc8UwrHlwcDyoE0/s9w== X-Proofpoint-ORIG-GUID: YCUPr6x3p8Vbcw3LfIJPt3mhzUzm1iEX X-Proofpoint-GUID: YCUPr6x3p8Vbcw3LfIJPt3mhzUzm1iEX X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.51,FMLib:17.12.100.49 definitions=2026-03-11_02,2026-03-09_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 bulkscore=0 phishscore=0 clxscore=1015 adultscore=0 suspectscore=0 priorityscore=1501 malwarescore=0 impostorscore=0 lowpriorityscore=0 spamscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2603050001 definitions=main-2603120065 Content-Type: text/plain; charset="utf-8" From: Ionut Nechita When multiple processes write to the same file and one of them is blocked waiting for MDS/OSD response (e.g., during MDS failover), other processes block indefinitely on down_write(&inode->i_rwsem) in ceph_start_io_write(). This causes hung task warnings: INFO: task dd:12345 blocked for more than 122 seconds. Call Trace: ceph_start_io_write+0x... ceph_write_iter+0x... The i_rwsem is held by a process doing fsync/writeback that is waiting for MDS or OSD response. Other writers queue up on the rwsem and block indefinitely. Fix this by using down_write_killable() instead of down_write(). This allows blocked processes to be killed with SIGKILL, preventing indefinite hangs. The function now returns an error code that callers must check. Update ceph_write_iter() to handle the new error return from ceph_start_io_write(). Signed-off-by: Ionut Nechita --- fs/ceph/file.c | 9 +++++++-- fs/ceph/io.c | 9 +++++++-- fs/ceph/io.h | 2 +- 3 files changed, 15 insertions(+), 5 deletions(-) diff --git a/fs/ceph/file.c b/fs/ceph/file.c index 6587c2d5af1e0..01e4f31b1f2f3 100644 --- a/fs/ceph/file.c +++ b/fs/ceph/file.c @@ -2359,8 +2359,13 @@ static ssize_t ceph_write_iter(struct kiocb *iocb, s= truct iov_iter *from) retry_snap: if (direct_lock) ceph_start_io_direct(inode); - else - ceph_start_io_write(inode); + else { + err =3D ceph_start_io_write(inode); + if (err) { + ceph_free_cap_flush(prealloc_cf); + return err; + } + } =20 if (iocb->ki_flags & IOCB_APPEND) { err =3D ceph_do_getattr(inode, CEPH_STAT_CAP_SIZE, false); diff --git a/fs/ceph/io.c b/fs/ceph/io.c index c456509b31c3f..f9ac89ec1d6a1 100644 --- a/fs/ceph/io.c +++ b/fs/ceph/io.c @@ -83,11 +83,16 @@ ceph_end_io_read(struct inode *inode) * Declare that a buffered write operation is about to start, and ensure * that we block all direct I/O. */ -void +int ceph_start_io_write(struct inode *inode) { - down_write(&inode->i_rwsem); + int ret; + + ret =3D down_write_killable(&inode->i_rwsem); + if (ret) + return ret; ceph_block_o_direct(ceph_inode(inode), inode); + return 0; } =20 /** diff --git a/fs/ceph/io.h b/fs/ceph/io.h index fa594cd77348a..94ce176df9997 100644 --- a/fs/ceph/io.h +++ b/fs/ceph/io.h @@ -4,7 +4,7 @@ =20 void ceph_start_io_read(struct inode *inode); void ceph_end_io_read(struct inode *inode); -void ceph_start_io_write(struct inode *inode); +int ceph_start_io_write(struct inode *inode); void ceph_end_io_write(struct inode *inode); void ceph_start_io_direct(struct inode *inode); void ceph_end_io_direct(struct inode *inode); --=20 2.53.0