From: Catherine Hoang catherine.hoang@oracle.com
[ Upstream commit 14a537983b228cb050ceca3a5b743d01315dc4aa ]
One of our VM cluster management products needs to snapshot KVM image files so that they can be restored in case of failure. Snapshotting is done by redirecting VM disk writes to a sidecar file and using reflink on the disk image, specifically the FICLONE ioctl as used by "cp --reflink". Reflink locks the source and destination files while it operates, which means that reads from the main vm disk image are blocked, causing the vm to stall. When an image file is heavily fragmented, the copy process could take several minutes. Some of the vm image files have 50-100 million extent records, and duplicating that much metadata locks the file for 30 minutes or more. Having activities suspended for such a long time in a cluster node could result in node eviction.
Clone operations and read IO do not change any data in the source file, so they should be able to run concurrently. Demote the exclusive locks taken by FICLONE to shared locks to allow reads while cloning. While a clone is in progress, writes will take the IOLOCK_EXCL, so they block until the clone completes.
Link: https://lore.kernel.org/linux-xfs/8911B94D-DD29-4D6E-B5BC-32EAF1866245@oracl... Signed-off-by: Catherine Hoang catherine.hoang@oracle.com Reviewed-by: "Darrick J. Wong" djwong@kernel.org Reviewed-by: Dave Chinner dchinner@redhat.com Reviewed-by: Christoph Hellwig hch@lst.de Signed-off-by: Chandan Babu R chandanbabu@kernel.org Signed-off-by: Leah Rumancik leah.rumancik@gmail.com --- fs/xfs/xfs_file.c | 63 +++++++++++++++++++++++++++++++++++--------- fs/xfs/xfs_inode.c | 17 ++++++++++++ fs/xfs/xfs_inode.h | 9 +++++++ fs/xfs/xfs_reflink.c | 4 +++ 4 files changed, 80 insertions(+), 13 deletions(-)
diff --git a/fs/xfs/xfs_file.c b/fs/xfs/xfs_file.c index 8de40cf63a5b..821cb86a83bd 100644 --- a/fs/xfs/xfs_file.c +++ b/fs/xfs/xfs_file.c @@ -212,10 +212,47 @@ xfs_ilock_iocb( }
return 0; }
+static int +xfs_ilock_iocb_for_write( + struct kiocb *iocb, + unsigned int *lock_mode) +{ + ssize_t ret; + struct xfs_inode *ip = XFS_I(file_inode(iocb->ki_filp)); + + ret = xfs_ilock_iocb(iocb, *lock_mode); + if (ret) + return ret; + + if (*lock_mode == XFS_IOLOCK_EXCL) + return 0; + if (!xfs_iflags_test(ip, XFS_IREMAPPING)) + return 0; + + xfs_iunlock(ip, *lock_mode); + *lock_mode = XFS_IOLOCK_EXCL; + return xfs_ilock_iocb(iocb, *lock_mode); +} + +static unsigned int +xfs_ilock_for_write_fault( + struct xfs_inode *ip) +{ + /* get a shared lock if no remapping in progress */ + xfs_ilock(ip, XFS_MMAPLOCK_SHARED); + if (!xfs_iflags_test(ip, XFS_IREMAPPING)) + return XFS_MMAPLOCK_SHARED; + + /* wait for remapping to complete */ + xfs_iunlock(ip, XFS_MMAPLOCK_SHARED); + xfs_ilock(ip, XFS_MMAPLOCK_EXCL); + return XFS_MMAPLOCK_EXCL; +} + STATIC ssize_t xfs_file_dio_read( struct kiocb *iocb, struct iov_iter *to) { @@ -521,11 +558,11 @@ xfs_file_dio_write_aligned( struct iov_iter *from) { unsigned int iolock = XFS_IOLOCK_SHARED; ssize_t ret;
- ret = xfs_ilock_iocb(iocb, iolock); + ret = xfs_ilock_iocb_for_write(iocb, &iolock); if (ret) return ret; ret = xfs_file_write_checks(iocb, from, &iolock); if (ret) goto out_unlock; @@ -588,11 +625,11 @@ xfs_file_dio_write_unaligned( retry_exclusive: iolock = XFS_IOLOCK_EXCL; flags = IOMAP_DIO_FORCE_WAIT; }
- ret = xfs_ilock_iocb(iocb, iolock); + ret = xfs_ilock_iocb_for_write(iocb, &iolock); if (ret) return ret;
/* * We can't properly handle unaligned direct I/O to reflink files yet, @@ -1156,11 +1193,11 @@ xfs_file_remap_range( goto out_unlock;
if (xfs_file_sync_writes(file_in) || xfs_file_sync_writes(file_out)) xfs_log_force_inode(dest); out_unlock: - xfs_iunlock2_io_mmap(src, dest); + xfs_iunlock2_remapping(src, dest); if (ret) trace_xfs_reflink_remap_range_error(dest, ret, _RET_IP_); /* * If the caller did not set CAN_SHORTEN, then it is not prepared to * handle partial results -- either the whole remap succeeds, or we @@ -1311,37 +1348,37 @@ __xfs_filemap_fault( bool write_fault) { struct inode *inode = file_inode(vmf->vma->vm_file); struct xfs_inode *ip = XFS_I(inode); vm_fault_t ret; + unsigned int lock_mode = 0;
trace_xfs_filemap_fault(ip, pe_size, write_fault);
if (write_fault) { sb_start_pagefault(inode->i_sb); file_update_time(vmf->vma->vm_file); }
+ if (IS_DAX(inode) || write_fault) + lock_mode = xfs_ilock_for_write_fault(XFS_I(inode)); + if (IS_DAX(inode)) { pfn_t pfn;
- xfs_ilock(XFS_I(inode), XFS_MMAPLOCK_SHARED); ret = xfs_dax_fault(vmf, pe_size, write_fault, &pfn); if (ret & VM_FAULT_NEEDDSYNC) ret = dax_finish_sync_fault(vmf, pe_size, pfn); - xfs_iunlock(XFS_I(inode), XFS_MMAPLOCK_SHARED); + } else if (write_fault) { + ret = iomap_page_mkwrite(vmf, &xfs_page_mkwrite_iomap_ops); } else { - if (write_fault) { - xfs_ilock(XFS_I(inode), XFS_MMAPLOCK_SHARED); - ret = iomap_page_mkwrite(vmf, - &xfs_page_mkwrite_iomap_ops); - xfs_iunlock(XFS_I(inode), XFS_MMAPLOCK_SHARED); - } else { - ret = filemap_fault(vmf); - } + ret = filemap_fault(vmf); }
+ if (lock_mode) + xfs_iunlock(XFS_I(inode), lock_mode); + if (write_fault) sb_end_pagefault(inode->i_sb); return ret; }
diff --git a/fs/xfs/xfs_inode.c b/fs/xfs/xfs_inode.c index 1d32823d5099..dc84c75be852 100644 --- a/fs/xfs/xfs_inode.c +++ b/fs/xfs/xfs_inode.c @@ -3642,10 +3642,27 @@ xfs_iunlock2_io_mmap( inode_unlock(VFS_I(ip2)); if (ip1 != ip2) inode_unlock(VFS_I(ip1)); }
+/* Drop the MMAPLOCK and the IOLOCK after a remap completes. */ +void +xfs_iunlock2_remapping( + struct xfs_inode *ip1, + struct xfs_inode *ip2) +{ + xfs_iflags_clear(ip1, XFS_IREMAPPING); + + if (ip1 != ip2) + xfs_iunlock(ip1, XFS_MMAPLOCK_SHARED); + xfs_iunlock(ip2, XFS_MMAPLOCK_EXCL); + + if (ip1 != ip2) + inode_unlock_shared(VFS_I(ip1)); + inode_unlock(VFS_I(ip2)); +} + /* * Reload the incore inode list for this inode. Caller should ensure that * the link count cannot change, either by taking ILOCK_SHARED or otherwise * preventing other threads from executing. */ diff --git a/fs/xfs/xfs_inode.h b/fs/xfs/xfs_inode.h index 85395ad2859c..3a81477c7797 100644 --- a/fs/xfs/xfs_inode.h +++ b/fs/xfs/xfs_inode.h @@ -345,10 +345,18 @@ static inline bool xfs_inode_has_large_extent_counts(struct xfs_inode *ip) #define XFS_INACTIVATING (1 << 13)
/* Quotacheck is running but inode has not been added to quota counts. */ #define XFS_IQUOTAUNCHECKED (1 << 14)
+/* + * Remap in progress. Callers that wish to update file data while + * holding a shared IOLOCK or MMAPLOCK must drop the lock and retake + * the lock in exclusive mode. Relocking the file will block until + * IREMAPPING is cleared. + */ +#define XFS_IREMAPPING (1U << 15) + /* All inode state flags related to inode reclaim. */ #define XFS_ALL_IRECLAIM_FLAGS (XFS_IRECLAIMABLE | \ XFS_IRECLAIM | \ XFS_NEED_INACTIVE | \ XFS_INACTIVATING) @@ -593,10 +601,11 @@ bool xfs_inode_needs_inactive(struct xfs_inode *ip);
void xfs_end_io(struct work_struct *work);
int xfs_ilock2_io_mmap(struct xfs_inode *ip1, struct xfs_inode *ip2); void xfs_iunlock2_io_mmap(struct xfs_inode *ip1, struct xfs_inode *ip2); +void xfs_iunlock2_remapping(struct xfs_inode *ip1, struct xfs_inode *ip2);
static inline bool xfs_inode_unlinked_incomplete( struct xfs_inode *ip) { diff --git a/fs/xfs/xfs_reflink.c b/fs/xfs/xfs_reflink.c index fe46bce8cae6..004f5a0444be 100644 --- a/fs/xfs/xfs_reflink.c +++ b/fs/xfs/xfs_reflink.c @@ -1537,10 +1537,14 @@ xfs_reflink_remap_prep( ret = xfs_flush_unmap_range(dest, pos_out, *len); } if (ret) goto out_unlock;
+ xfs_iflags_set(src, XFS_IREMAPPING); + if (inode_in != inode_out) + xfs_ilock_demote(src, XFS_IOLOCK_EXCL | XFS_MMAPLOCK_EXCL); + return 0; out_unlock: xfs_iunlock2_io_mmap(src, dest); return ret; }