Instead of using an input pointer parameter as the return value and have an int as the return type of find_desired_extent, rework the function to directly return the found offset. Doing that the 'ret' variable in btrfs_llseek_file can be removed. Additional (subjective) benefit is that btrfs' llseek function now resemebles those of the other major filesystems.
Signed-off-by: Nikolay Borisov <[email protected]> --- fs/btrfs/file.c | 34 +++++++++++++++++++--------------- 1 file changed, 19 insertions(+), 15 deletions(-) diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c index cda1882f5cb5..cb6f7ac8cd15 100644 --- a/fs/btrfs/file.c +++ b/fs/btrfs/file.c @@ -3342,7 +3342,8 @@ static long btrfs_fallocate(struct file *file, int mode, return ret; } -static int find_desired_extent(struct inode *inode, loff_t *offset, int whence) +static loff_t find_desired_extent(struct inode *inode, loff_t offset, + int whence) { struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb); struct extent_map *em = NULL; @@ -3354,14 +3355,14 @@ static int find_desired_extent(struct inode *inode, loff_t *offset, int whence) u64 len; int ret = 0; - if (i_size == 0 || *offset >= i_size) + if (i_size == 0 || offset >= i_size) return -ENXIO; /* - * *offset can be negative, in this case we start finding DATA/HOLE from + * offset can be negative, in this case we start finding DATA/HOLE from * the very start of the file. */ - start = max_t(loff_t, 0, *offset); + start = max_t(loff_t, 0, offset); lockstart = round_down(start, fs_info->sectorsize); lockend = round_up(i_size, fs_info->sectorsize); @@ -3396,21 +3397,23 @@ static int find_desired_extent(struct inode *inode, loff_t *offset, int whence) cond_resched(); } free_extent_map(em); - if (!ret) { + unlock_extent_cached(&BTRFS_I(inode)->io_tree, lockstart, lockend, + &cached_state); + if (ret) { + offset = ret; + } else { if (whence == SEEK_DATA && start >= i_size) - ret = -ENXIO; + offset = -ENXIO; else - *offset = min_t(loff_t, start, i_size); + offset = min_t(loff_t, start, i_size); } - unlock_extent_cached(&BTRFS_I(inode)->io_tree, lockstart, lockend, - &cached_state); - return ret; + + return offset; } static loff_t btrfs_file_llseek(struct file *file, loff_t offset, int whence) { struct inode *inode = file->f_mapping->host; - int ret; switch (whence) { default: @@ -3418,13 +3421,14 @@ static loff_t btrfs_file_llseek(struct file *file, loff_t offset, int whence) case SEEK_DATA: case SEEK_HOLE: inode_lock_shared(inode); - ret = find_desired_extent(inode, &offset, whence); + offset = find_desired_extent(inode, offset, whence); inode_unlock_shared(inode); - - if (ret) - return ret; + break; } + if (offset < 0) + return offset; + return vfs_setpos(file, offset, inode->i_sb->s_maxbytes); } -- 2.17.1
