diff options
Diffstat (limited to 'fs/btrfs/file.c')
| -rw-r--r-- | fs/btrfs/file.c | 53 |
1 files changed, 29 insertions, 24 deletions
diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c index a3c22e16509b..d38dc8c31533 100644 --- a/fs/btrfs/file.c +++ b/fs/btrfs/file.c @@ -399,7 +399,7 @@ static noinline int btrfs_copy_from_user(loff_t pos, size_t write_bytes, size_t copied = 0; size_t total_copied = 0; int pg = 0; - int offset = pos & (PAGE_SIZE - 1); + int offset = offset_in_page(pos); while (write_bytes > 0) { size_t count = min_t(size_t, @@ -1611,7 +1611,7 @@ static noinline ssize_t btrfs_buffered_write(struct kiocb *iocb, return -ENOMEM; while (iov_iter_count(i) > 0) { - size_t offset = pos & (PAGE_SIZE - 1); + size_t offset = offset_in_page(pos); size_t sector_offset; size_t write_bytes = min(iov_iter_count(i), nrptrs * (size_t)PAGE_SIZE - @@ -2005,7 +2005,7 @@ int btrfs_release_file(struct inode *inode, struct file *filp) filp->private_data = NULL; /* - * ordered_data_close is set by settattr when we are about to truncate + * ordered_data_close is set by setattr when we are about to truncate * a file from a non-zero size to a zero size. This tries to * flush down new bytes that may have been written if the * application were using truncate to replace a file in place. @@ -2089,8 +2089,32 @@ int btrfs_sync_file(struct file *file, loff_t start, loff_t end, int datasync) atomic_inc(&root->log_batch); /* + * Before we acquired the inode's lock, someone may have dirtied more + * pages in the target range. We need to make sure that writeback for + * any such pages does not start while we are logging the inode, because + * if it does, any of the following might happen when we are not doing a + * full inode sync: + * + * 1) We log an extent after its writeback finishes but before its + * checksums are added to the csum tree, leading to -EIO errors + * when attempting to read the extent after a log replay. + * + * 2) We can end up logging an extent before its writeback finishes. + * Therefore after the log replay we will have a file extent item + * pointing to an unwritten extent (and no data checksums as well). + * + * So trigger writeback for any eventual new dirty pages and then we + * wait for all ordered extents to complete below. + */ + ret = start_ordered_ops(inode, start, end); + if (ret) { + inode_unlock(inode); + goto out; + } + + /* * We have to do this here to avoid the priority inversion of waiting on - * IO of a lower priority task while holding a transaciton open. + * IO of a lower priority task while holding a transaction open. */ ret = btrfs_wait_ordered_range(inode, start, len); if (ret) { @@ -2130,7 +2154,7 @@ int btrfs_sync_file(struct file *file, loff_t start, loff_t end, int datasync) * here we could get into a situation where we're waiting on IO to * happen that is blocked on a transaction trying to commit. With start * we inc the extwriter counter, so we wait for all extwriters to exit - * before we start blocking join'ers. This comment is to keep somebody + * before we start blocking joiners. This comment is to keep somebody * from thinking they are super smart and changing this to * btrfs_join_transaction *cough*Josef*cough*. */ @@ -2162,25 +2186,6 @@ int btrfs_sync_file(struct file *file, loff_t start, loff_t end, int datasync) up_write(&BTRFS_I(inode)->dio_sem); inode_unlock(inode); - /* - * If any of the ordered extents had an error, just return it to user - * space, so that the application knows some writes didn't succeed and - * can take proper action (retry for e.g.). Blindly committing the - * transaction in this case, would fool userspace that everything was - * successful. And we also want to make sure our log doesn't contain - * file extent items pointing to extents that weren't fully written to - - * just like in the non fast fsync path, where we check for the ordered - * operation's error flag before writing to the log tree and return -EIO - * if any of them had this flag set (btrfs_wait_ordered_range) - - * therefore we need to check for errors in the ordered operations, - * which are indicated by ctx.io_err. - */ - if (ctx.io_err) { - btrfs_end_transaction(trans); - ret = ctx.io_err; - goto out; - } - if (ret != BTRFS_NO_LOG_SYNC) { if (!ret) { ret = btrfs_sync_log(trans, root, &ctx); |