6.1-stable review patch. If anyone has any objections, please let me know.
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From: Amir Goldstein amir73il@gmail.com
commit 0db1d53937fafa8bb96e077375691e16902f4899 upstream.
The callers of vfs_iter_write() are required to hold file_start_write(). file_start_write() is a no-op for the S_ISBLK() case, but it is really needed when the backing file is a regular file.
We are going to move file_{start,end}_write() into vfs_iter_write(), but we need to fix this first, so that the fix could be backported to stable kernels.
Suggested-by: Christoph Hellwig hch@lst.de Link: https://lore.kernel.org/r/ZV8ETIpM+wZa33B5@infradead.org/ Cc: stable@vger.kernel.org Signed-off-by: Amir Goldstein amir73il@gmail.com Link: https://lore.kernel.org/r/20231123092000.2665902-1-amir73il@gmail.com Acked-by: Martin K. Petersen martin.petersen@oracle.com Reviewed-by: Christoph Hellwig hch@lst.de Reviewed-by: Jens Axboe axboe@kernel.dk Signed-off-by: Christian Brauner brauner@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/target/target_core_file.c | 10 +++++++--- 1 file changed, 7 insertions(+), 3 deletions(-)
--- a/drivers/target/target_core_file.c +++ b/drivers/target/target_core_file.c @@ -338,11 +338,13 @@ static int fd_do_rw(struct se_cmd *cmd, }
iov_iter_bvec(&iter, is_write, bvec, sgl_nents, len); - if (is_write) + if (is_write) { + file_start_write(fd); ret = vfs_iter_write(fd, &iter, &pos, 0); - else + file_end_write(fd); + } else { ret = vfs_iter_read(fd, &iter, &pos, 0); - + } if (is_write) { if (ret < 0 || ret != data_length) { pr_err("%s() write returned %d\n", __func__, ret); @@ -474,7 +476,9 @@ fd_execute_write_same(struct se_cmd *cmd }
iov_iter_bvec(&iter, ITER_SOURCE, bvec, nolb, len); + file_start_write(fd_dev->fd_file); ret = vfs_iter_write(fd_dev->fd_file, &iter, &pos, 0); + file_end_write(fd_dev->fd_file);
kfree(bvec); if (ret < 0 || ret != len) {