2 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
3 * Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved.
5 * This copyrighted material is made available to anyone wishing to use,
6 * modify, copy, or redistribute it subject to the terms and conditions
7 * of the GNU General Public License version 2.
10 #include <linux/slab.h>
11 #include <linux/spinlock.h>
12 #include <linux/completion.h>
13 #include <linux/buffer_head.h>
14 #include <linux/pagemap.h>
15 #include <linux/uio.h>
16 #include <linux/blkdev.h>
19 #include <linux/gfs2_ondisk.h>
20 #include <linux/ext2_fs.h>
21 #include <linux/crc32.h>
22 #include <linux/lm_interface.h>
23 #include <linux/writeback.h>
24 #include <asm/uaccess.h>
45 * Most fields left uninitialised to catch anybody who tries to
46 * use them. f_flags set to prevent file_accessed() from touching
47 * any other part of this. Its use is purely as a flag so that we
48 * know (in readpage()) whether or not do to locking.
50 struct file gfs2_internal_file_sentinel = {
51 .f_flags = O_NOATIME|O_RDONLY,
54 static int gfs2_read_actor(read_descriptor_t *desc, struct page *page,
55 unsigned long offset, unsigned long size)
58 unsigned long count = desc->count;
64 memcpy(desc->arg.data, kaddr + offset, size);
67 desc->count = count - size;
68 desc->written += size;
69 desc->arg.buf += size;
73 int gfs2_internal_read(struct gfs2_inode *ip, struct file_ra_state *ra_state,
74 char *buf, loff_t *pos, unsigned size)
76 struct inode *inode = &ip->i_inode;
77 read_descriptor_t desc;
82 do_generic_mapping_read(inode->i_mapping, ra_state,
83 &gfs2_internal_file_sentinel, pos, &desc,
85 return desc.written ? desc.written : desc.error;
89 * gfs2_llseek - seek to a location in a file
92 * @origin: Where to seek from (SEEK_SET, SEEK_CUR, or SEEK_END)
94 * SEEK_END requires the glock for the file because it references the
97 * Returns: The new offset, or errno
100 static loff_t gfs2_llseek(struct file *file, loff_t offset, int origin)
102 struct gfs2_inode *ip = GFS2_I(file->f_mapping->host);
103 struct gfs2_holder i_gh;
107 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY,
110 error = remote_llseek(file, offset, origin);
111 gfs2_glock_dq_uninit(&i_gh);
114 error = remote_llseek(file, offset, origin);
120 * gfs2_readdir - Read directory entries from a directory
121 * @file: The directory to read from
122 * @dirent: Buffer for dirents
123 * @filldir: Function used to do the copying
128 static int gfs2_readdir(struct file *file, void *dirent, filldir_t filldir)
130 struct inode *dir = file->f_mapping->host;
131 struct gfs2_inode *dip = GFS2_I(dir);
132 struct gfs2_holder d_gh;
133 u64 offset = file->f_pos;
136 gfs2_holder_init(dip->i_gl, LM_ST_SHARED, GL_ATIME, &d_gh);
137 error = gfs2_glock_nq_atime(&d_gh);
139 gfs2_holder_uninit(&d_gh);
143 error = gfs2_dir_read(dir, &offset, dirent, filldir);
145 gfs2_glock_dq_uninit(&d_gh);
147 file->f_pos = offset;
154 * @table: A table of 32 u32 flags
155 * @val: a 32 bit value to convert
157 * This function can be used to convert between fsflags values and
158 * GFS2's own flags values.
160 * Returns: the converted flags
162 static u32 fsflags_cvt(const u32 *table, u32 val)
174 static const u32 fsflags_to_gfs2[32] = {
176 [4] = GFS2_DIF_IMMUTABLE,
177 [5] = GFS2_DIF_APPENDONLY,
178 [7] = GFS2_DIF_NOATIME,
179 [12] = GFS2_DIF_EXHASH,
180 [14] = GFS2_DIF_JDATA,
181 [20] = GFS2_DIF_DIRECTIO,
184 static const u32 gfs2_to_fsflags[32] = {
185 [gfs2fl_Sync] = FS_SYNC_FL,
186 [gfs2fl_Immutable] = FS_IMMUTABLE_FL,
187 [gfs2fl_AppendOnly] = FS_APPEND_FL,
188 [gfs2fl_NoAtime] = FS_NOATIME_FL,
189 [gfs2fl_ExHash] = FS_INDEX_FL,
190 [gfs2fl_Jdata] = FS_JOURNAL_DATA_FL,
191 [gfs2fl_Directio] = FS_DIRECTIO_FL,
192 [gfs2fl_InheritDirectio] = FS_DIRECTIO_FL,
193 [gfs2fl_InheritJdata] = FS_JOURNAL_DATA_FL,
196 static int gfs2_get_flags(struct file *filp, u32 __user *ptr)
198 struct inode *inode = filp->f_path.dentry->d_inode;
199 struct gfs2_inode *ip = GFS2_I(inode);
200 struct gfs2_holder gh;
204 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, GL_ATIME, &gh);
205 error = gfs2_glock_nq_atime(&gh);
209 fsflags = fsflags_cvt(gfs2_to_fsflags, ip->i_di.di_flags);
210 if (put_user(fsflags, ptr))
213 gfs2_glock_dq_m(1, &gh);
214 gfs2_holder_uninit(&gh);
218 void gfs2_set_inode_flags(struct inode *inode)
220 struct gfs2_inode *ip = GFS2_I(inode);
221 struct gfs2_dinode_host *di = &ip->i_di;
222 unsigned int flags = inode->i_flags;
224 flags &= ~(S_SYNC|S_APPEND|S_IMMUTABLE|S_NOATIME|S_DIRSYNC);
225 if (di->di_flags & GFS2_DIF_IMMUTABLE)
226 flags |= S_IMMUTABLE;
227 if (di->di_flags & GFS2_DIF_APPENDONLY)
229 if (di->di_flags & GFS2_DIF_NOATIME)
231 if (di->di_flags & GFS2_DIF_SYNC)
233 inode->i_flags = flags;
236 /* Flags that can be set by user space */
237 #define GFS2_FLAGS_USER_SET (GFS2_DIF_JDATA| \
239 GFS2_DIF_IMMUTABLE| \
240 GFS2_DIF_APPENDONLY| \
244 GFS2_DIF_INHERIT_DIRECTIO| \
245 GFS2_DIF_INHERIT_JDATA)
248 * gfs2_set_flags - set flags on an inode
250 * @flags: The flags to set
251 * @mask: Indicates which flags are valid
254 static int do_gfs2_set_flags(struct file *filp, u32 reqflags, u32 mask)
256 struct inode *inode = filp->f_path.dentry->d_inode;
257 struct gfs2_inode *ip = GFS2_I(inode);
258 struct gfs2_sbd *sdp = GFS2_SB(inode);
259 struct buffer_head *bh;
260 struct gfs2_holder gh;
262 u32 new_flags, flags;
264 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
268 flags = ip->i_di.di_flags;
269 new_flags = (flags & ~mask) | (reqflags & mask);
270 if ((new_flags ^ flags) == 0)
273 if (S_ISDIR(inode->i_mode)) {
274 if ((new_flags ^ flags) & GFS2_DIF_JDATA)
275 new_flags ^= (GFS2_DIF_JDATA|GFS2_DIF_INHERIT_JDATA);
276 if ((new_flags ^ flags) & GFS2_DIF_DIRECTIO)
277 new_flags ^= (GFS2_DIF_DIRECTIO|GFS2_DIF_INHERIT_DIRECTIO);
281 if ((new_flags ^ flags) & ~GFS2_FLAGS_USER_SET)
285 if (IS_IMMUTABLE(inode) && (new_flags & GFS2_DIF_IMMUTABLE))
287 if (IS_APPEND(inode) && (new_flags & GFS2_DIF_APPENDONLY))
289 if (((new_flags ^ flags) & GFS2_DIF_IMMUTABLE) &&
290 !capable(CAP_LINUX_IMMUTABLE))
292 if (!IS_IMMUTABLE(inode)) {
293 error = permission(inode, MAY_WRITE, NULL);
298 error = gfs2_trans_begin(sdp, RES_DINODE, 0);
301 error = gfs2_meta_inode_buffer(ip, &bh);
304 gfs2_trans_add_bh(ip->i_gl, bh, 1);
305 ip->i_di.di_flags = new_flags;
306 gfs2_dinode_out(ip, bh->b_data);
308 gfs2_set_inode_flags(inode);
312 gfs2_glock_dq_uninit(&gh);
316 static int gfs2_set_flags(struct file *filp, u32 __user *ptr)
318 u32 fsflags, gfsflags;
319 if (get_user(fsflags, ptr))
321 gfsflags = fsflags_cvt(fsflags_to_gfs2, fsflags);
322 return do_gfs2_set_flags(filp, gfsflags, ~0);
325 static long gfs2_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
328 case FS_IOC_GETFLAGS:
329 return gfs2_get_flags(filp, (u32 __user *)arg);
330 case FS_IOC_SETFLAGS:
331 return gfs2_set_flags(filp, (u32 __user *)arg);
339 * @file: The file to map
340 * @vma: The VMA which described the mapping
342 * Returns: 0 or error code
345 static int gfs2_mmap(struct file *file, struct vm_area_struct *vma)
347 struct gfs2_inode *ip = GFS2_I(file->f_mapping->host);
348 struct gfs2_holder i_gh;
351 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, GL_ATIME, &i_gh);
352 error = gfs2_glock_nq_atime(&i_gh);
354 gfs2_holder_uninit(&i_gh);
358 /* This is VM_MAYWRITE instead of VM_WRITE because a call
359 to mprotect() can turn on VM_WRITE later. */
361 if ((vma->vm_flags & (VM_MAYSHARE | VM_MAYWRITE)) ==
362 (VM_MAYSHARE | VM_MAYWRITE))
363 vma->vm_ops = &gfs2_vm_ops_sharewrite;
365 vma->vm_ops = &gfs2_vm_ops_private;
367 gfs2_glock_dq_uninit(&i_gh);
373 * gfs2_open - open a file
374 * @inode: the inode to open
375 * @file: the struct file for this opening
380 static int gfs2_open(struct inode *inode, struct file *file)
382 struct gfs2_inode *ip = GFS2_I(inode);
383 struct gfs2_holder i_gh;
384 struct gfs2_file *fp;
387 fp = kzalloc(sizeof(struct gfs2_file), GFP_KERNEL);
391 mutex_init(&fp->f_fl_mutex);
393 gfs2_assert_warn(GFS2_SB(inode), !file->private_data);
394 file->private_data = fp;
396 if (S_ISREG(ip->i_inode.i_mode)) {
397 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY,
402 if (!(file->f_flags & O_LARGEFILE) &&
403 ip->i_di.di_size > MAX_NON_LFS) {
408 /* Listen to the Direct I/O flag */
410 if (ip->i_di.di_flags & GFS2_DIF_DIRECTIO)
411 file->f_flags |= O_DIRECT;
413 gfs2_glock_dq_uninit(&i_gh);
419 gfs2_glock_dq_uninit(&i_gh);
421 file->private_data = NULL;
427 * gfs2_close - called to close a struct file
428 * @inode: the inode the struct file belongs to
429 * @file: the struct file being closed
434 static int gfs2_close(struct inode *inode, struct file *file)
436 struct gfs2_sbd *sdp = inode->i_sb->s_fs_info;
437 struct gfs2_file *fp;
439 fp = file->private_data;
440 file->private_data = NULL;
442 if (gfs2_assert_warn(sdp, fp))
451 * gfs2_fsync - sync the dirty data for a file (across the cluster)
452 * @file: the file that points to the dentry (we ignore this)
453 * @dentry: the dentry that points to the inode to sync
455 * The VFS will flush "normal" data for us. We only need to worry
456 * about metadata here. For journaled data, we just do a log flush
457 * as we can't avoid it. Otherwise we can just bale out if datasync
458 * is set. For stuffed inodes we must flush the log in order to
459 * ensure that all data is on disk.
461 * The call to write_inode_now() is there to write back metadata and
462 * the inode itself. It does also try and write the data, but thats
463 * (hopefully) a no-op due to the VFS having already called filemap_fdatawrite()
469 static int gfs2_fsync(struct file *file, struct dentry *dentry, int datasync)
471 struct inode *inode = dentry->d_inode;
472 int sync_state = inode->i_state & (I_DIRTY_SYNC|I_DIRTY_DATASYNC);
475 if (gfs2_is_jdata(GFS2_I(inode))) {
476 gfs2_log_flush(GFS2_SB(inode), GFS2_I(inode)->i_gl);
480 if (sync_state != 0) {
482 ret = write_inode_now(inode, 0);
484 if (gfs2_is_stuffed(GFS2_I(inode)))
485 gfs2_log_flush(GFS2_SB(inode), GFS2_I(inode)->i_gl);
492 * gfs2_lock - acquire/release a posix lock on a file
493 * @file: the file pointer
494 * @cmd: either modify or retrieve lock state, possibly wait
495 * @fl: type and range of lock
500 static int gfs2_lock(struct file *file, int cmd, struct file_lock *fl)
502 struct gfs2_inode *ip = GFS2_I(file->f_mapping->host);
503 struct gfs2_sbd *sdp = GFS2_SB(file->f_mapping->host);
504 struct lm_lockname name =
505 { .ln_number = ip->i_no_addr,
506 .ln_type = LM_TYPE_PLOCK };
508 if (!(fl->fl_flags & FL_POSIX))
510 if ((ip->i_inode.i_mode & (S_ISGID | S_IXGRP)) == S_ISGID)
513 if (sdp->sd_args.ar_localflocks) {
515 posix_test_lock(file, fl);
518 return posix_lock_file_wait(file, fl);
522 if (cmd == F_CANCELLK) {
525 fl->fl_type = F_UNLCK;
528 return gfs2_lm_plock_get(sdp, &name, file, fl);
529 else if (fl->fl_type == F_UNLCK)
530 return gfs2_lm_punlock(sdp, &name, file, fl);
532 return gfs2_lm_plock(sdp, &name, file, cmd, fl);
535 static int do_flock(struct file *file, int cmd, struct file_lock *fl)
537 struct gfs2_file *fp = file->private_data;
538 struct gfs2_holder *fl_gh = &fp->f_fl_gh;
539 struct gfs2_inode *ip = GFS2_I(file->f_path.dentry->d_inode);
540 struct gfs2_glock *gl;
545 state = (fl->fl_type == F_WRLCK) ? LM_ST_EXCLUSIVE : LM_ST_SHARED;
546 flags = (IS_SETLKW(cmd) ? 0 : LM_FLAG_TRY) | GL_EXACT | GL_NOCACHE;
548 mutex_lock(&fp->f_fl_mutex);
552 if (fl_gh->gh_state == state)
555 flock_lock_file_wait(file,
556 &(struct file_lock){.fl_type = F_UNLCK});
557 gfs2_glock_dq_uninit(fl_gh);
559 error = gfs2_glock_get(GFS2_SB(&ip->i_inode),
560 ip->i_no_addr, &gfs2_flock_glops,
566 gfs2_holder_init(gl, state, flags, fl_gh);
569 error = gfs2_glock_nq(fl_gh);
571 gfs2_holder_uninit(fl_gh);
572 if (error == GLR_TRYFAILED)
575 error = flock_lock_file_wait(file, fl);
576 gfs2_assert_warn(GFS2_SB(&ip->i_inode), !error);
580 mutex_unlock(&fp->f_fl_mutex);
584 static void do_unflock(struct file *file, struct file_lock *fl)
586 struct gfs2_file *fp = file->private_data;
587 struct gfs2_holder *fl_gh = &fp->f_fl_gh;
589 mutex_lock(&fp->f_fl_mutex);
590 flock_lock_file_wait(file, fl);
592 gfs2_glock_dq_uninit(fl_gh);
593 mutex_unlock(&fp->f_fl_mutex);
597 * gfs2_flock - acquire/release a flock lock on a file
598 * @file: the file pointer
599 * @cmd: either modify or retrieve lock state, possibly wait
600 * @fl: type and range of lock
605 static int gfs2_flock(struct file *file, int cmd, struct file_lock *fl)
607 struct gfs2_inode *ip = GFS2_I(file->f_mapping->host);
608 struct gfs2_sbd *sdp = GFS2_SB(file->f_mapping->host);
610 if (!(fl->fl_flags & FL_FLOCK))
612 if ((ip->i_inode.i_mode & (S_ISGID | S_IXGRP)) == S_ISGID)
615 if (sdp->sd_args.ar_localflocks)
616 return flock_lock_file_wait(file, fl);
618 if (fl->fl_type == F_UNLCK) {
619 do_unflock(file, fl);
622 return do_flock(file, cmd, fl);
626 const struct file_operations gfs2_file_fops = {
627 .llseek = gfs2_llseek,
628 .read = do_sync_read,
629 .aio_read = generic_file_aio_read,
630 .write = do_sync_write,
631 .aio_write = generic_file_aio_write,
632 .unlocked_ioctl = gfs2_ioctl,
635 .release = gfs2_close,
639 .splice_read = generic_file_splice_read,
640 .splice_write = generic_file_splice_write,
643 const struct file_operations gfs2_dir_fops = {
644 .readdir = gfs2_readdir,
645 .unlocked_ioctl = gfs2_ioctl,
647 .release = gfs2_close,