On 07/12/2018 02:23 PM, Gu Jinxiang wrote:
fs_devices is always passed to btrfs_scan_one_device which overrides it. And in the call stack below fs_devices is passed to btrfs_scan_one_device from btrfs_mount_root. And in btrfs_mount_root the output fs_devices of this call stack is not used. btrfs_mount_root -> btrfs_parse_early_options ->btrfs_scan_one_device So, there is no necessary to pass fs_devices from btrfs_mount_root, use a local variable in btrfs_parse_early_options is enough. Signed-off-by: Gu Jinxiang <[email protected]> Reviewed-by: Anand Jain <[email protected]> --- Changelog: v4: changed a line warp, and adjusted the order of two rows. v3: rebase to misc-next. v2: deal with Nikolay's comment, make changelog more clair. fs/btrfs/super.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c index 39d8e39b2fe1..44f58bdb5fa6 100644 --- a/fs/btrfs/super.c +++ b/fs/btrfs/super.c @@ -884,10 +884,11 @@ int btrfs_parse_options(struct btrfs_fs_info *info, char *options, * only when we need to allocate a new super block. */ static int btrfs_parse_early_options(const char *options, fmode_t flags, - void *holder, struct btrfs_fs_devices **fs_devices) + void *holder) { substring_t args[MAX_OPT_ARGS]; char *device_name, *opts, *orig, *p; + struct btrfs_fs_devices *fs_devices = NULL; int error = 0;if (!options)@@ -916,7 +917,7 @@ static int btrfs_parse_early_options(const char *options, fmode_t flags, goto out; } error = btrfs_scan_one_device(device_name, - flags, holder, fs_devices); + flags, holder, &fs_devices);
1. Extend line until 8-char, and remain to start below the (. - error = btrfs_scan_one_device(device_name, - flags, holder, fs_devices); + error = btrfs_scan_one_device(device_name, flags, + holder, &fs_devices); 2. Fixed the conflict on top of the recent uuid_mutex changes from David. I see this patch isn't in the misc-next yet, applied to my local WS, pending pull request. Thanks, Anand
kfree(device_name); if (error) goto out; @@ -1524,8 +1525,7 @@ static struct dentry *btrfs_mount_root(struct file_system_type *fs_type, if (!(flags & SB_RDONLY)) mode |= FMODE_WRITE;- error = btrfs_parse_early_options(data, mode, fs_type,- &fs_devices); + error = btrfs_parse_early_options(data, mode, fs_type); if (error) { return ERR_PTR(error); }
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