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/sched.h>
11 #include <linux/slab.h>
12 #include <linux/spinlock.h>
13 #include <linux/completion.h>
14 #include <linux/buffer_head.h>
15 #include <linux/pagemap.h>
16 #include <linux/uio.h>
17 #include <linux/blkdev.h>
19 #include <linux/smp_lock.h>
21 #include <linux/gfs2_ondisk.h>
22 #include <linux/ext2_fs.h>
23 #include <linux/crc32.h>
24 #include <linux/lm_interface.h>
25 #include <linux/writeback.h>
26 #include <asm/uaccess.h>
46 /* For regular, non-NFS */
48 struct gfs2_sbd *fdr_sbd;
51 filldir_t fdr_filldir;
56 * Most fields left uninitialised to catch anybody who tries to
57 * use them. f_flags set to prevent file_accessed() from touching
58 * any other part of this. Its use is purely as a flag so that we
59 * know (in readpage()) whether or not do to locking.
61 struct file gfs2_internal_file_sentinel = {
62 .f_flags = O_NOATIME|O_RDONLY,
65 static int gfs2_read_actor(read_descriptor_t *desc, struct page *page,
66 unsigned long offset, unsigned long size)
69 unsigned long count = desc->count;
75 memcpy(desc->arg.data, kaddr + offset, size);
78 desc->count = count - size;
79 desc->written += size;
80 desc->arg.buf += size;
84 int gfs2_internal_read(struct gfs2_inode *ip, struct file_ra_state *ra_state,
85 char *buf, loff_t *pos, unsigned size)
87 struct inode *inode = &ip->i_inode;
88 read_descriptor_t desc;
93 do_generic_mapping_read(inode->i_mapping, ra_state,
94 &gfs2_internal_file_sentinel, pos, &desc,
96 return desc.written ? desc.written : desc.error;
100 * gfs2_llseek - seek to a location in a file
102 * @offset: the offset
103 * @origin: Where to seek from (SEEK_SET, SEEK_CUR, or SEEK_END)
105 * SEEK_END requires the glock for the file because it references the
108 * Returns: The new offset, or errno
111 static loff_t gfs2_llseek(struct file *file, loff_t offset, int origin)
113 struct gfs2_inode *ip = GFS2_I(file->f_mapping->host);
114 struct gfs2_holder i_gh;
118 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY,
121 error = remote_llseek(file, offset, origin);
122 gfs2_glock_dq_uninit(&i_gh);
125 error = remote_llseek(file, offset, origin);
131 * filldir_func - Report a directory entry to the caller of gfs2_dir_read()
132 * @opaque: opaque data used by the function
133 * @name: the name of the directory entry
134 * @length: the length of the name
135 * @offset: the entry's offset in the directory
136 * @inum: the inode number the entry points to
137 * @type: the type of inode the entry points to
139 * Returns: 0 on success, 1 if buffer full
142 static int filldir_func(void *opaque, const char *name, unsigned int length,
143 u64 offset, struct gfs2_inum_host *inum,
146 struct filldir_reg *fdr = (struct filldir_reg *)opaque;
147 struct gfs2_sbd *sdp = fdr->fdr_sbd;
150 error = fdr->fdr_filldir(fdr->fdr_opaque, name, length, offset,
151 inum->no_addr, type);
155 if (fdr->fdr_prefetch && !(length == 1 && *name == '.')) {
156 gfs2_glock_prefetch_num(sdp, inum->no_addr, &gfs2_inode_glops,
157 LM_ST_SHARED, LM_FLAG_TRY | LM_FLAG_ANY);
158 gfs2_glock_prefetch_num(sdp, inum->no_addr, &gfs2_iopen_glops,
159 LM_ST_SHARED, LM_FLAG_TRY);
166 * gfs2_readdir - Read directory entries from a directory
167 * @file: The directory to read from
168 * @dirent: Buffer for dirents
169 * @filldir: Function used to do the copying
174 static int gfs2_readdir(struct file *file, void *dirent, filldir_t filldir)
176 struct inode *dir = file->f_mapping->host;
177 struct gfs2_inode *dip = GFS2_I(dir);
178 struct filldir_reg fdr;
179 struct gfs2_holder d_gh;
180 u64 offset = file->f_pos;
183 fdr.fdr_sbd = GFS2_SB(dir);
184 fdr.fdr_prefetch = 1;
185 fdr.fdr_filldir = filldir;
186 fdr.fdr_opaque = dirent;
188 gfs2_holder_init(dip->i_gl, LM_ST_SHARED, GL_ATIME, &d_gh);
189 error = gfs2_glock_nq_atime(&d_gh);
191 gfs2_holder_uninit(&d_gh);
195 error = gfs2_dir_read(dir, &offset, &fdr, filldir_func);
197 gfs2_glock_dq_uninit(&d_gh);
199 file->f_pos = offset;
206 * @table: A table of 32 u32 flags
207 * @val: a 32 bit value to convert
209 * This function can be used to convert between fsflags values and
210 * GFS2's own flags values.
212 * Returns: the converted flags
214 static u32 fsflags_cvt(const u32 *table, u32 val)
226 static const u32 fsflags_to_gfs2[32] = {
228 [4] = GFS2_DIF_IMMUTABLE,
229 [5] = GFS2_DIF_APPENDONLY,
230 [7] = GFS2_DIF_NOATIME,
231 [12] = GFS2_DIF_EXHASH,
232 [14] = GFS2_DIF_JDATA,
233 [20] = GFS2_DIF_DIRECTIO,
236 static const u32 gfs2_to_fsflags[32] = {
237 [gfs2fl_Sync] = FS_SYNC_FL,
238 [gfs2fl_Immutable] = FS_IMMUTABLE_FL,
239 [gfs2fl_AppendOnly] = FS_APPEND_FL,
240 [gfs2fl_NoAtime] = FS_NOATIME_FL,
241 [gfs2fl_ExHash] = FS_INDEX_FL,
242 [gfs2fl_Jdata] = FS_JOURNAL_DATA_FL,
243 [gfs2fl_Directio] = FS_DIRECTIO_FL,
244 [gfs2fl_InheritDirectio] = FS_DIRECTIO_FL,
245 [gfs2fl_InheritJdata] = FS_JOURNAL_DATA_FL,
248 static int gfs2_get_flags(struct file *filp, u32 __user *ptr)
250 struct inode *inode = filp->f_path.dentry->d_inode;
251 struct gfs2_inode *ip = GFS2_I(inode);
252 struct gfs2_holder gh;
256 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, GL_ATIME, &gh);
257 error = gfs2_glock_nq_atime(&gh);
261 fsflags = fsflags_cvt(gfs2_to_fsflags, ip->i_di.di_flags);
262 if (put_user(fsflags, ptr))
265 gfs2_glock_dq_m(1, &gh);
266 gfs2_holder_uninit(&gh);
270 void gfs2_set_inode_flags(struct inode *inode)
272 struct gfs2_inode *ip = GFS2_I(inode);
273 struct gfs2_dinode_host *di = &ip->i_di;
274 unsigned int flags = inode->i_flags;
276 flags &= ~(S_SYNC|S_APPEND|S_IMMUTABLE|S_NOATIME|S_DIRSYNC);
277 if (di->di_flags & GFS2_DIF_IMMUTABLE)
278 flags |= S_IMMUTABLE;
279 if (di->di_flags & GFS2_DIF_APPENDONLY)
281 if (di->di_flags & GFS2_DIF_NOATIME)
283 if (di->di_flags & GFS2_DIF_SYNC)
285 inode->i_flags = flags;
288 /* Flags that can be set by user space */
289 #define GFS2_FLAGS_USER_SET (GFS2_DIF_JDATA| \
291 GFS2_DIF_IMMUTABLE| \
292 GFS2_DIF_APPENDONLY| \
296 GFS2_DIF_INHERIT_DIRECTIO| \
297 GFS2_DIF_INHERIT_JDATA)
300 * gfs2_set_flags - set flags on an inode
302 * @flags: The flags to set
303 * @mask: Indicates which flags are valid
306 static int do_gfs2_set_flags(struct file *filp, u32 reqflags, u32 mask)
308 struct inode *inode = filp->f_path.dentry->d_inode;
309 struct gfs2_inode *ip = GFS2_I(inode);
310 struct gfs2_sbd *sdp = GFS2_SB(inode);
311 struct buffer_head *bh;
312 struct gfs2_holder gh;
314 u32 new_flags, flags;
316 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
320 flags = ip->i_di.di_flags;
321 new_flags = (flags & ~mask) | (reqflags & mask);
322 if ((new_flags ^ flags) == 0)
325 if (S_ISDIR(inode->i_mode)) {
326 if ((new_flags ^ flags) & GFS2_DIF_JDATA)
327 new_flags ^= (GFS2_DIF_JDATA|GFS2_DIF_INHERIT_JDATA);
328 if ((new_flags ^ flags) & GFS2_DIF_DIRECTIO)
329 new_flags ^= (GFS2_DIF_DIRECTIO|GFS2_DIF_INHERIT_DIRECTIO);
333 if ((new_flags ^ flags) & ~GFS2_FLAGS_USER_SET)
337 if (IS_IMMUTABLE(inode) && (new_flags & GFS2_DIF_IMMUTABLE))
339 if (IS_APPEND(inode) && (new_flags & GFS2_DIF_APPENDONLY))
341 if (((new_flags ^ flags) & GFS2_DIF_IMMUTABLE) &&
342 !capable(CAP_LINUX_IMMUTABLE))
344 if (!IS_IMMUTABLE(inode)) {
345 error = permission(inode, MAY_WRITE, NULL);
350 error = gfs2_trans_begin(sdp, RES_DINODE, 0);
353 error = gfs2_meta_inode_buffer(ip, &bh);
356 gfs2_trans_add_bh(ip->i_gl, bh, 1);
357 ip->i_di.di_flags = new_flags;
358 gfs2_dinode_out(ip, bh->b_data);
360 gfs2_set_inode_flags(inode);
364 gfs2_glock_dq_uninit(&gh);
368 static int gfs2_set_flags(struct file *filp, u32 __user *ptr)
370 u32 fsflags, gfsflags;
371 if (get_user(fsflags, ptr))
373 gfsflags = fsflags_cvt(fsflags_to_gfs2, fsflags);
374 return do_gfs2_set_flags(filp, gfsflags, ~0);
377 static long gfs2_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
380 case FS_IOC_GETFLAGS:
381 return gfs2_get_flags(filp, (u32 __user *)arg);
382 case FS_IOC_SETFLAGS:
383 return gfs2_set_flags(filp, (u32 __user *)arg);
391 * @file: The file to map
392 * @vma: The VMA which described the mapping
394 * Returns: 0 or error code
397 static int gfs2_mmap(struct file *file, struct vm_area_struct *vma)
399 struct gfs2_inode *ip = GFS2_I(file->f_mapping->host);
400 struct gfs2_holder i_gh;
403 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, GL_ATIME, &i_gh);
404 error = gfs2_glock_nq_atime(&i_gh);
406 gfs2_holder_uninit(&i_gh);
410 /* This is VM_MAYWRITE instead of VM_WRITE because a call
411 to mprotect() can turn on VM_WRITE later. */
413 if ((vma->vm_flags & (VM_MAYSHARE | VM_MAYWRITE)) ==
414 (VM_MAYSHARE | VM_MAYWRITE))
415 vma->vm_ops = &gfs2_vm_ops_sharewrite;
417 vma->vm_ops = &gfs2_vm_ops_private;
419 gfs2_glock_dq_uninit(&i_gh);
425 * gfs2_open - open a file
426 * @inode: the inode to open
427 * @file: the struct file for this opening
432 static int gfs2_open(struct inode *inode, struct file *file)
434 struct gfs2_inode *ip = GFS2_I(inode);
435 struct gfs2_holder i_gh;
436 struct gfs2_file *fp;
439 fp = kzalloc(sizeof(struct gfs2_file), GFP_KERNEL);
443 mutex_init(&fp->f_fl_mutex);
445 gfs2_assert_warn(GFS2_SB(inode), !file->private_data);
446 file->private_data = fp;
448 if (S_ISREG(ip->i_inode.i_mode)) {
449 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY,
454 if (!(file->f_flags & O_LARGEFILE) &&
455 ip->i_di.di_size > MAX_NON_LFS) {
460 /* Listen to the Direct I/O flag */
462 if (ip->i_di.di_flags & GFS2_DIF_DIRECTIO)
463 file->f_flags |= O_DIRECT;
465 gfs2_glock_dq_uninit(&i_gh);
471 gfs2_glock_dq_uninit(&i_gh);
473 file->private_data = NULL;
479 * gfs2_close - called to close a struct file
480 * @inode: the inode the struct file belongs to
481 * @file: the struct file being closed
486 static int gfs2_close(struct inode *inode, struct file *file)
488 struct gfs2_sbd *sdp = inode->i_sb->s_fs_info;
489 struct gfs2_file *fp;
491 fp = file->private_data;
492 file->private_data = NULL;
494 if (gfs2_assert_warn(sdp, fp))
503 * gfs2_fsync - sync the dirty data for a file (across the cluster)
504 * @file: the file that points to the dentry (we ignore this)
505 * @dentry: the dentry that points to the inode to sync
507 * The VFS will flush "normal" data for us. We only need to worry
508 * about metadata here. For journaled data, we just do a log flush
509 * as we can't avoid it. Otherwise we can just bale out if datasync
510 * is set. For stuffed inodes we must flush the log in order to
511 * ensure that all data is on disk.
513 * The call to write_inode_now() is there to write back metadata and
514 * the inode itself. It does also try and write the data, but thats
515 * (hopefully) a no-op due to the VFS having already called filemap_fdatawrite()
521 static int gfs2_fsync(struct file *file, struct dentry *dentry, int datasync)
523 struct inode *inode = dentry->d_inode;
524 int sync_state = inode->i_state & (I_DIRTY_SYNC|I_DIRTY_DATASYNC);
527 if (gfs2_is_jdata(GFS2_I(inode))) {
528 gfs2_log_flush(GFS2_SB(inode), GFS2_I(inode)->i_gl);
532 if (sync_state != 0) {
534 ret = write_inode_now(inode, 0);
536 if (gfs2_is_stuffed(GFS2_I(inode)))
537 gfs2_log_flush(GFS2_SB(inode), GFS2_I(inode)->i_gl);
544 * gfs2_lock - acquire/release a posix lock on a file
545 * @file: the file pointer
546 * @cmd: either modify or retrieve lock state, possibly wait
547 * @fl: type and range of lock
552 static int gfs2_lock(struct file *file, int cmd, struct file_lock *fl)
554 struct gfs2_inode *ip = GFS2_I(file->f_mapping->host);
555 struct gfs2_sbd *sdp = GFS2_SB(file->f_mapping->host);
556 struct lm_lockname name =
557 { .ln_number = ip->i_num.no_addr,
558 .ln_type = LM_TYPE_PLOCK };
560 if (!(fl->fl_flags & FL_POSIX))
562 if ((ip->i_inode.i_mode & (S_ISGID | S_IXGRP)) == S_ISGID)
565 if (sdp->sd_args.ar_localflocks) {
567 struct file_lock tmp;
569 ret = posix_test_lock(file, fl, &tmp);
570 fl->fl_type = F_UNLCK;
572 memcpy(fl, &tmp, sizeof(struct file_lock));
575 return posix_lock_file_wait(file, fl);
580 return gfs2_lm_plock_get(sdp, &name, file, fl);
581 else if (fl->fl_type == F_UNLCK)
582 return gfs2_lm_punlock(sdp, &name, file, fl);
584 return gfs2_lm_plock(sdp, &name, file, cmd, fl);
587 static int do_flock(struct file *file, int cmd, struct file_lock *fl)
589 struct gfs2_file *fp = file->private_data;
590 struct gfs2_holder *fl_gh = &fp->f_fl_gh;
591 struct gfs2_inode *ip = GFS2_I(file->f_path.dentry->d_inode);
592 struct gfs2_glock *gl;
597 state = (fl->fl_type == F_WRLCK) ? LM_ST_EXCLUSIVE : LM_ST_SHARED;
598 flags = (IS_SETLKW(cmd) ? 0 : LM_FLAG_TRY) | GL_EXACT | GL_NOCACHE;
600 mutex_lock(&fp->f_fl_mutex);
604 if (fl_gh->gh_state == state)
607 flock_lock_file_wait(file,
608 &(struct file_lock){.fl_type = F_UNLCK});
609 gfs2_glock_dq_uninit(fl_gh);
611 error = gfs2_glock_get(GFS2_SB(&ip->i_inode),
612 ip->i_num.no_addr, &gfs2_flock_glops,
618 gfs2_holder_init(gl, state, flags, fl_gh);
621 error = gfs2_glock_nq(fl_gh);
623 gfs2_holder_uninit(fl_gh);
624 if (error == GLR_TRYFAILED)
627 error = flock_lock_file_wait(file, fl);
628 gfs2_assert_warn(GFS2_SB(&ip->i_inode), !error);
632 mutex_unlock(&fp->f_fl_mutex);
636 static void do_unflock(struct file *file, struct file_lock *fl)
638 struct gfs2_file *fp = file->private_data;
639 struct gfs2_holder *fl_gh = &fp->f_fl_gh;
641 mutex_lock(&fp->f_fl_mutex);
642 flock_lock_file_wait(file, fl);
644 gfs2_glock_dq_uninit(fl_gh);
645 mutex_unlock(&fp->f_fl_mutex);
649 * gfs2_flock - acquire/release a flock lock on a file
650 * @file: the file pointer
651 * @cmd: either modify or retrieve lock state, possibly wait
652 * @fl: type and range of lock
657 static int gfs2_flock(struct file *file, int cmd, struct file_lock *fl)
659 struct gfs2_inode *ip = GFS2_I(file->f_mapping->host);
660 struct gfs2_sbd *sdp = GFS2_SB(file->f_mapping->host);
662 if (!(fl->fl_flags & FL_FLOCK))
664 if ((ip->i_inode.i_mode & (S_ISGID | S_IXGRP)) == S_ISGID)
667 if (sdp->sd_args.ar_localflocks)
668 return flock_lock_file_wait(file, fl);
670 if (fl->fl_type == F_UNLCK) {
671 do_unflock(file, fl);
674 return do_flock(file, cmd, fl);
678 const struct file_operations gfs2_file_fops = {
679 .llseek = gfs2_llseek,
680 .read = do_sync_read,
681 .aio_read = generic_file_aio_read,
682 .write = do_sync_write,
683 .aio_write = generic_file_aio_write,
684 .unlocked_ioctl = gfs2_ioctl,
687 .release = gfs2_close,
690 .sendfile = generic_file_sendfile,
692 .splice_read = generic_file_splice_read,
693 .splice_write = generic_file_splice_write,
696 const struct file_operations gfs2_dir_fops = {
697 .readdir = gfs2_readdir,
698 .unlocked_ioctl = gfs2_ioctl,
700 .release = gfs2_close,