diff options
Diffstat (limited to 'fs/fuse/file.c')
| -rw-r--r-- | fs/fuse/file.c | 101 |
1 files changed, 79 insertions, 22 deletions
diff --git a/fs/fuse/file.c b/fs/fuse/file.c index 570ca4053c80..b03d253ece15 100644 --- a/fs/fuse/file.c +++ b/fs/fuse/file.c @@ -207,7 +207,7 @@ int fuse_open_common(struct inode *inode, struct file *file, bool isdir) return err; if (lock_inode) - mutex_lock(&inode->i_mutex); + inode_lock(inode); err = fuse_do_open(fc, get_node_id(inode), file, isdir); @@ -215,7 +215,7 @@ int fuse_open_common(struct inode *inode, struct file *file, bool isdir) fuse_finish_open(inode, file); if (lock_inode) - mutex_unlock(&inode->i_mutex); + inode_unlock(inode); return err; } @@ -413,9 +413,9 @@ static int fuse_flush(struct file *file, fl_owner_t id) if (err) return err; - mutex_lock(&inode->i_mutex); + inode_lock(inode); fuse_sync_writes(inode); - mutex_unlock(&inode->i_mutex); + inode_unlock(inode); req = fuse_get_req_nofail_nopages(fc, file); memset(&inarg, 0, sizeof(inarg)); @@ -450,7 +450,7 @@ int fuse_fsync_common(struct file *file, loff_t start, loff_t end, if (is_bad_inode(inode)) return -EIO; - mutex_lock(&inode->i_mutex); + inode_lock(inode); /* * Start writeback against all dirty pages of the inode, then @@ -486,7 +486,7 @@ int fuse_fsync_common(struct file *file, loff_t start, loff_t end, err = 0; } out: - mutex_unlock(&inode->i_mutex); + inode_unlock(inode); return err; } @@ -1160,7 +1160,7 @@ static ssize_t fuse_file_write_iter(struct kiocb *iocb, struct iov_iter *from) return generic_file_write_iter(iocb, from); } - mutex_lock(&inode->i_mutex); + inode_lock(inode); /* We can write back this queue in page reclaim */ current->backing_dev_info = inode_to_bdi(inode); @@ -1210,7 +1210,7 @@ static ssize_t fuse_file_write_iter(struct kiocb *iocb, struct iov_iter *from) } out: current->backing_dev_info = NULL; - mutex_unlock(&inode->i_mutex); + inode_unlock(inode); return written ? written : err; } @@ -1322,10 +1322,10 @@ ssize_t fuse_direct_io(struct fuse_io_priv *io, struct iov_iter *iter, if (!cuse && fuse_range_is_writeback(inode, idx_from, idx_to)) { if (!write) - mutex_lock(&inode->i_mutex); + inode_lock(inode); fuse_sync_writes(inode); if (!write) - mutex_unlock(&inode->i_mutex); + inode_unlock(inode); } while (count) { @@ -1413,14 +1413,14 @@ static ssize_t fuse_direct_write_iter(struct kiocb *iocb, struct iov_iter *from) return -EIO; /* Don't allow parallel writes to the same file */ - mutex_lock(&inode->i_mutex); + inode_lock(inode); res = generic_write_checks(iocb, from); if (res > 0) res = fuse_direct_io(&io, from, &iocb->ki_pos, FUSE_DIO_WRITE); fuse_invalidate_attr(inode); if (res > 0) fuse_write_update_size(inode, iocb->ki_pos); - mutex_unlock(&inode->i_mutex); + inode_unlock(inode); return res; } @@ -2231,20 +2231,77 @@ static sector_t fuse_bmap(struct address_space *mapping, sector_t block) return err ? 0 : outarg.block; } +static loff_t fuse_lseek(struct file *file, loff_t offset, int whence) +{ + struct inode *inode = file->f_mapping->host; + struct fuse_conn *fc = get_fuse_conn(inode); + struct fuse_file *ff = file->private_data; + FUSE_ARGS(args); + struct fuse_lseek_in inarg = { + .fh = ff->fh, + .offset = offset, + .whence = whence + }; + struct fuse_lseek_out outarg; + int err; + + if (fc->no_lseek) + goto fallback; + + args.in.h.opcode = FUSE_LSEEK; + args.in.h.nodeid = ff->nodeid; + args.in.numargs = 1; + args.in.args[0].size = sizeof(inarg); + args.in.args[0].value = &inarg; + args.out.numargs = 1; + args.out.args[0].size = sizeof(outarg); + args.out.args[0].value = &outarg; + err = fuse_simple_request(fc, &args); + if (err) { + if (err == -ENOSYS) { + fc->no_lseek = 1; + goto fallback; + } + return err; + } + + return vfs_setpos(file, outarg.offset, inode->i_sb->s_maxbytes); + +fallback: + err = fuse_update_attributes(inode, NULL, file, NULL); + if (!err) + return generic_file_llseek(file, offset, whence); + else + return err; +} + static loff_t fuse_file_llseek(struct file *file, loff_t offset, int whence) { loff_t retval; struct inode *inode = file_inode(file); - /* No i_mutex protection necessary for SEEK_CUR and SEEK_SET */ - if (whence == SEEK_CUR || whence == SEEK_SET) - return generic_file_llseek(file, offset, whence); - - mutex_lock(&inode->i_mutex); - retval = fuse_update_attributes(inode, NULL, file, NULL); - if (!retval) + switch (whence) { + case SEEK_SET: + case SEEK_CUR: + /* No i_mutex protection necessary for SEEK_CUR and SEEK_SET */ retval = generic_file_llseek(file, offset, whence); - mutex_unlock(&inode->i_mutex); + break; + case SEEK_END: + inode_lock(inode); + retval = fuse_update_attributes(inode, NULL, file, NULL); + if (!retval) + retval = generic_file_llseek(file, offset, whence); + inode_unlock(inode); + break; + case SEEK_HOLE: + case SEEK_DATA: + inode_lock(inode); + retval = fuse_lseek(file, offset, whence); + inode_unlock(inode); + break; + default: + retval = -EINVAL; + } return retval; } @@ -2887,7 +2944,7 @@ static long fuse_file_fallocate(struct file *file, int mode, loff_t offset, return -EOPNOTSUPP; if (lock_inode) { - mutex_lock(&inode->i_mutex); + inode_lock(inode); if (mode & FALLOC_FL_PUNCH_HOLE) { loff_t endbyte = offset + length - 1; err = filemap_write_and_wait_range(inode->i_mapping, @@ -2933,7 +2990,7 @@ out: clear_bit(FUSE_I_SIZE_UNSTABLE, &fi->state); if (lock_inode) - mutex_unlock(&inode->i_mutex); + inode_unlock(inode); return err; } |