| /* |
| * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. |
| * Copyright (C) 2004-2005 Red Hat, Inc. All rights reserved. |
| * |
| * This copyrighted material is made available to anyone wishing to use, |
| * modify, copy, or redistribute it subject to the terms and conditions |
| * of the GNU General Public License v.2. |
| */ |
| |
| #include <linux/sched.h> |
| #include <linux/slab.h> |
| #include <linux/spinlock.h> |
| #include <linux/completion.h> |
| #include <linux/buffer_head.h> |
| #include <linux/pagemap.h> |
| #include <linux/uio.h> |
| #include <linux/blkdev.h> |
| #include <linux/mm.h> |
| #include <linux/smp_lock.h> |
| #include <linux/gfs2_ioctl.h> |
| #include <linux/fs.h> |
| #include <asm/semaphore.h> |
| #include <asm/uaccess.h> |
| |
| #include "gfs2.h" |
| #include "bmap.h" |
| #include "dir.h" |
| #include "glock.h" |
| #include "glops.h" |
| #include "inode.h" |
| #include "lm.h" |
| #include "log.h" |
| #include "meta_io.h" |
| #include "ops_file.h" |
| #include "ops_vm.h" |
| #include "quota.h" |
| #include "rgrp.h" |
| #include "trans.h" |
| |
| /* "bad" is for NFS support */ |
| struct filldir_bad_entry { |
| char *fbe_name; |
| unsigned int fbe_length; |
| uint64_t fbe_offset; |
| struct gfs2_inum fbe_inum; |
| unsigned int fbe_type; |
| }; |
| |
| struct filldir_bad { |
| struct gfs2_sbd *fdb_sbd; |
| |
| struct filldir_bad_entry *fdb_entry; |
| unsigned int fdb_entry_num; |
| unsigned int fdb_entry_off; |
| |
| char *fdb_name; |
| unsigned int fdb_name_size; |
| unsigned int fdb_name_off; |
| }; |
| |
| /* For regular, non-NFS */ |
| struct filldir_reg { |
| struct gfs2_sbd *fdr_sbd; |
| int fdr_prefetch; |
| |
| filldir_t fdr_filldir; |
| void *fdr_opaque; |
| }; |
| |
| /* |
| * Most fields left uninitialised to catch anybody who tries to |
| * use them. f_flags set to prevent file_accessed() from touching |
| * any other part of this. Its use is purely as a flag so that we |
| * know (in readpage()) whether or not do to locking. |
| */ |
| struct file gfs2_internal_file_sentinal = { |
| .f_flags = O_NOATIME|O_RDONLY, |
| }; |
| |
| static int gfs2_read_actor(read_descriptor_t *desc, struct page *page, |
| unsigned long offset, unsigned long size) |
| { |
| char *kaddr; |
| unsigned long count = desc->count; |
| |
| if (size > count) |
| size = count; |
| |
| kaddr = kmap(page); |
| memcpy(desc->arg.buf, kaddr + offset, size); |
| kunmap(page); |
| |
| desc->count = count - size; |
| desc->written += size; |
| desc->arg.buf += size; |
| return size; |
| } |
| |
| int gfs2_internal_read(struct gfs2_inode *ip, struct file_ra_state *ra_state, |
| char *buf, loff_t *pos, unsigned size) |
| { |
| struct inode *inode = ip->i_vnode; |
| read_descriptor_t desc; |
| desc.written = 0; |
| desc.arg.buf = buf; |
| desc.count = size; |
| desc.error = 0; |
| do_generic_mapping_read(inode->i_mapping, ra_state, |
| &gfs2_internal_file_sentinal, pos, &desc, |
| gfs2_read_actor); |
| return desc.written ? desc.written : desc.error; |
| } |
| |
| /** |
| * gfs2_llseek - seek to a location in a file |
| * @file: the file |
| * @offset: the offset |
| * @origin: Where to seek from (SEEK_SET, SEEK_CUR, or SEEK_END) |
| * |
| * SEEK_END requires the glock for the file because it references the |
| * file's size. |
| * |
| * Returns: The new offset, or errno |
| */ |
| |
| static loff_t gfs2_llseek(struct file *file, loff_t offset, int origin) |
| { |
| struct gfs2_inode *ip = get_v2ip(file->f_mapping->host); |
| struct gfs2_holder i_gh; |
| loff_t error; |
| |
| if (origin == 2) { |
| error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, |
| &i_gh); |
| if (!error) { |
| error = remote_llseek(file, offset, origin); |
| gfs2_glock_dq_uninit(&i_gh); |
| } |
| } else |
| error = remote_llseek(file, offset, origin); |
| |
| return error; |
| } |
| |
| |
| static ssize_t gfs2_direct_IO_read(struct kiocb *iocb, const struct iovec *iov, |
| loff_t offset, unsigned long nr_segs) |
| { |
| struct file *file = iocb->ki_filp; |
| struct address_space *mapping = file->f_mapping; |
| ssize_t retval; |
| |
| retval = filemap_write_and_wait(mapping); |
| if (retval == 0) { |
| retval = mapping->a_ops->direct_IO(READ, iocb, iov, offset, |
| nr_segs); |
| } |
| return retval; |
| } |
| |
| /** |
| * __gfs2_file_aio_read - The main GFS2 read function |
| * |
| * N.B. This is almost, but not quite the same as __generic_file_aio_read() |
| * the important subtle different being that inode->i_size isn't valid |
| * unless we are holding a lock, and we do this _only_ on the O_DIRECT |
| * path since otherwise locking is done entirely at the page cache |
| * layer. |
| */ |
| static ssize_t __gfs2_file_aio_read(struct kiocb *iocb, |
| const struct iovec *iov, |
| unsigned long nr_segs, loff_t *ppos) |
| { |
| struct file *filp = iocb->ki_filp; |
| struct gfs2_inode *ip = get_v2ip(filp->f_mapping->host); |
| struct gfs2_holder gh; |
| ssize_t retval; |
| unsigned long seg; |
| size_t count; |
| |
| count = 0; |
| for (seg = 0; seg < nr_segs; seg++) { |
| const struct iovec *iv = &iov[seg]; |
| |
| /* |
| * If any segment has a negative length, or the cumulative |
| * length ever wraps negative then return -EINVAL. |
| */ |
| count += iv->iov_len; |
| if (unlikely((ssize_t)(count|iv->iov_len) < 0)) |
| return -EINVAL; |
| if (access_ok(VERIFY_WRITE, iv->iov_base, iv->iov_len)) |
| continue; |
| if (seg == 0) |
| return -EFAULT; |
| nr_segs = seg; |
| count -= iv->iov_len; /* This segment is no good */ |
| break; |
| } |
| |
| /* coalesce the iovecs and go direct-to-BIO for O_DIRECT */ |
| if (filp->f_flags & O_DIRECT) { |
| loff_t pos = *ppos, size; |
| struct address_space *mapping; |
| struct inode *inode; |
| |
| mapping = filp->f_mapping; |
| inode = mapping->host; |
| retval = 0; |
| if (!count) |
| goto out; /* skip atime */ |
| |
| gfs2_holder_init(ip->i_gl, LM_ST_SHARED, GL_ATIME, &gh); |
| retval = gfs2_glock_nq_m_atime(1, &gh); |
| if (retval) |
| goto out; |
| if (gfs2_is_stuffed(ip)) { |
| gfs2_glock_dq_m(1, &gh); |
| gfs2_holder_uninit(&gh); |
| goto fallback_to_normal; |
| } |
| size = i_size_read(inode); |
| if (pos < size) { |
| retval = gfs2_direct_IO_read(iocb, iov, pos, nr_segs); |
| if (retval > 0 && !is_sync_kiocb(iocb)) |
| retval = -EIOCBQUEUED; |
| if (retval > 0) |
| *ppos = pos + retval; |
| } |
| file_accessed(filp); |
| gfs2_glock_dq_m(1, &gh); |
| gfs2_holder_uninit(&gh); |
| goto out; |
| } |
| |
| fallback_to_normal: |
| retval = 0; |
| if (count) { |
| for (seg = 0; seg < nr_segs; seg++) { |
| read_descriptor_t desc; |
| |
| desc.written = 0; |
| desc.arg.buf = iov[seg].iov_base; |
| desc.count = iov[seg].iov_len; |
| if (desc.count == 0) |
| continue; |
| desc.error = 0; |
| do_generic_file_read(filp,ppos,&desc,file_read_actor); |
| retval += desc.written; |
| if (desc.error) { |
| retval = retval ?: desc.error; |
| break; |
| } |
| } |
| } |
| out: |
| return retval; |
| } |
| |
| /** |
| * gfs2_read - Read bytes from a file |
| * @file: The file to read from |
| * @buf: The buffer to copy into |
| * @size: The amount of data requested |
| * @offset: The current file offset |
| * |
| * Outputs: Offset - updated according to number of bytes read |
| * |
| * Returns: The number of bytes read, errno on failure |
| */ |
| |
| static ssize_t gfs2_read(struct file *filp, char __user *buf, size_t size, |
| loff_t *offset) |
| { |
| struct iovec local_iov = { .iov_base = buf, .iov_len = size }; |
| struct kiocb kiocb; |
| ssize_t ret; |
| |
| init_sync_kiocb(&kiocb, filp); |
| ret = __gfs2_file_aio_read(&kiocb, &local_iov, 1, offset); |
| if (-EIOCBQUEUED == ret) |
| ret = wait_on_sync_kiocb(&kiocb); |
| return ret; |
| } |
| |
| static ssize_t gfs2_file_readv(struct file *filp, const struct iovec *iov, |
| unsigned long nr_segs, loff_t *ppos) |
| { |
| struct kiocb kiocb; |
| ssize_t ret; |
| |
| init_sync_kiocb(&kiocb, filp); |
| ret = __gfs2_file_aio_read(&kiocb, iov, nr_segs, ppos); |
| if (-EIOCBQUEUED == ret) |
| ret = wait_on_sync_kiocb(&kiocb); |
| return ret; |
| } |
| |
| static ssize_t gfs2_file_aio_read(struct kiocb *iocb, char __user *buf, |
| size_t count, loff_t pos) |
| { |
| struct iovec local_iov = { .iov_base = buf, .iov_len = count }; |
| |
| BUG_ON(iocb->ki_pos != pos); |
| return __gfs2_file_aio_read(iocb, &local_iov, 1, &iocb->ki_pos); |
| } |
| |
| |
| /** |
| * filldir_reg_func - Report a directory entry to the caller of gfs2_dir_read() |
| * @opaque: opaque data used by the function |
| * @name: the name of the directory entry |
| * @length: the length of the name |
| * @offset: the entry's offset in the directory |
| * @inum: the inode number the entry points to |
| * @type: the type of inode the entry points to |
| * |
| * Returns: 0 on success, 1 if buffer full |
| */ |
| |
| static int filldir_reg_func(void *opaque, const char *name, unsigned int length, |
| uint64_t offset, struct gfs2_inum *inum, |
| unsigned int type) |
| { |
| struct filldir_reg *fdr = (struct filldir_reg *)opaque; |
| struct gfs2_sbd *sdp = fdr->fdr_sbd; |
| int error; |
| |
| error = fdr->fdr_filldir(fdr->fdr_opaque, name, length, offset, |
| inum->no_formal_ino, type); |
| if (error) |
| return 1; |
| |
| if (fdr->fdr_prefetch && !(length == 1 && *name == '.')) { |
| gfs2_glock_prefetch_num(sdp, |
| inum->no_addr, &gfs2_inode_glops, |
| LM_ST_SHARED, LM_FLAG_TRY | LM_FLAG_ANY); |
| gfs2_glock_prefetch_num(sdp, |
| inum->no_addr, &gfs2_iopen_glops, |
| LM_ST_SHARED, LM_FLAG_TRY); |
| } |
| |
| return 0; |
| } |
| |
| /** |
| * readdir_reg - Read directory entries from a directory |
| * @file: The directory to read from |
| * @dirent: Buffer for dirents |
| * @filldir: Function used to do the copying |
| * |
| * Returns: errno |
| */ |
| |
| static int readdir_reg(struct file *file, void *dirent, filldir_t filldir) |
| { |
| struct gfs2_inode *dip = get_v2ip(file->f_mapping->host); |
| struct filldir_reg fdr; |
| struct gfs2_holder d_gh; |
| uint64_t offset = file->f_pos; |
| int error; |
| |
| fdr.fdr_sbd = dip->i_sbd; |
| fdr.fdr_prefetch = 1; |
| fdr.fdr_filldir = filldir; |
| fdr.fdr_opaque = dirent; |
| |
| gfs2_holder_init(dip->i_gl, LM_ST_SHARED, GL_ATIME, &d_gh); |
| error = gfs2_glock_nq_atime(&d_gh); |
| if (error) { |
| gfs2_holder_uninit(&d_gh); |
| return error; |
| } |
| |
| error = gfs2_dir_read(dip, &offset, &fdr, filldir_reg_func); |
| |
| gfs2_glock_dq_uninit(&d_gh); |
| |
| file->f_pos = offset; |
| |
| return error; |
| } |
| |
| /** |
| * filldir_bad_func - Report a directory entry to the caller of gfs2_dir_read() |
| * @opaque: opaque data used by the function |
| * @name: the name of the directory entry |
| * @length: the length of the name |
| * @offset: the entry's offset in the directory |
| * @inum: the inode number the entry points to |
| * @type: the type of inode the entry points to |
| * |
| * For supporting NFS. |
| * |
| * Returns: 0 on success, 1 if buffer full |
| */ |
| |
| static int filldir_bad_func(void *opaque, const char *name, unsigned int length, |
| uint64_t offset, struct gfs2_inum *inum, |
| unsigned int type) |
| { |
| struct filldir_bad *fdb = (struct filldir_bad *)opaque; |
| struct gfs2_sbd *sdp = fdb->fdb_sbd; |
| struct filldir_bad_entry *fbe; |
| |
| if (fdb->fdb_entry_off == fdb->fdb_entry_num || |
| fdb->fdb_name_off + length > fdb->fdb_name_size) |
| return 1; |
| |
| fbe = &fdb->fdb_entry[fdb->fdb_entry_off]; |
| fbe->fbe_name = fdb->fdb_name + fdb->fdb_name_off; |
| memcpy(fbe->fbe_name, name, length); |
| fbe->fbe_length = length; |
| fbe->fbe_offset = offset; |
| fbe->fbe_inum = *inum; |
| fbe->fbe_type = type; |
| |
| fdb->fdb_entry_off++; |
| fdb->fdb_name_off += length; |
| |
| if (!(length == 1 && *name == '.')) { |
| gfs2_glock_prefetch_num(sdp, |
| inum->no_addr, &gfs2_inode_glops, |
| LM_ST_SHARED, LM_FLAG_TRY | LM_FLAG_ANY); |
| gfs2_glock_prefetch_num(sdp, |
| inum->no_addr, &gfs2_iopen_glops, |
| LM_ST_SHARED, LM_FLAG_TRY); |
| } |
| |
| return 0; |
| } |
| |
| /** |
| * readdir_bad - Read directory entries from a directory |
| * @file: The directory to read from |
| * @dirent: Buffer for dirents |
| * @filldir: Function used to do the copying |
| * |
| * For supporting NFS. |
| * |
| * Returns: errno |
| */ |
| |
| static int readdir_bad(struct file *file, void *dirent, filldir_t filldir) |
| { |
| struct gfs2_inode *dip = get_v2ip(file->f_mapping->host); |
| struct gfs2_sbd *sdp = dip->i_sbd; |
| struct filldir_reg fdr; |
| unsigned int entries, size; |
| struct filldir_bad *fdb; |
| struct gfs2_holder d_gh; |
| uint64_t offset = file->f_pos; |
| unsigned int x; |
| struct filldir_bad_entry *fbe; |
| int error; |
| |
| entries = gfs2_tune_get(sdp, gt_entries_per_readdir); |
| size = sizeof(struct filldir_bad) + |
| entries * (sizeof(struct filldir_bad_entry) + GFS2_FAST_NAME_SIZE); |
| |
| fdb = kzalloc(size, GFP_KERNEL); |
| if (!fdb) |
| return -ENOMEM; |
| |
| fdb->fdb_sbd = sdp; |
| fdb->fdb_entry = (struct filldir_bad_entry *)(fdb + 1); |
| fdb->fdb_entry_num = entries; |
| fdb->fdb_name = ((char *)fdb) + sizeof(struct filldir_bad) + |
| entries * sizeof(struct filldir_bad_entry); |
| fdb->fdb_name_size = entries * GFS2_FAST_NAME_SIZE; |
| |
| gfs2_holder_init(dip->i_gl, LM_ST_SHARED, GL_ATIME, &d_gh); |
| error = gfs2_glock_nq_atime(&d_gh); |
| if (error) { |
| gfs2_holder_uninit(&d_gh); |
| goto out; |
| } |
| |
| error = gfs2_dir_read(dip, &offset, fdb, filldir_bad_func); |
| |
| gfs2_glock_dq_uninit(&d_gh); |
| |
| fdr.fdr_sbd = sdp; |
| fdr.fdr_prefetch = 0; |
| fdr.fdr_filldir = filldir; |
| fdr.fdr_opaque = dirent; |
| |
| for (x = 0; x < fdb->fdb_entry_off; x++) { |
| fbe = &fdb->fdb_entry[x]; |
| |
| error = filldir_reg_func(&fdr, |
| fbe->fbe_name, fbe->fbe_length, |
| fbe->fbe_offset, |
| &fbe->fbe_inum, fbe->fbe_type); |
| if (error) { |
| file->f_pos = fbe->fbe_offset; |
| error = 0; |
| goto out; |
| } |
| } |
| |
| file->f_pos = offset; |
| |
| out: |
| kfree(fdb); |
| |
| return error; |
| } |
| |
| /** |
| * gfs2_readdir - Read directory entries from a directory |
| * @file: The directory to read from |
| * @dirent: Buffer for dirents |
| * @filldir: Function used to do the copying |
| * |
| * Returns: errno |
| */ |
| |
| static int gfs2_readdir(struct file *file, void *dirent, filldir_t filldir) |
| { |
| int error; |
| |
| if (strcmp(current->comm, "nfsd") != 0) |
| error = readdir_reg(file, dirent, filldir); |
| else |
| error = readdir_bad(file, dirent, filldir); |
| |
| return error; |
| } |
| |
| static int gfs2_ioctl_flags(struct gfs2_inode *ip, unsigned int cmd, |
| unsigned long arg) |
| { |
| unsigned int lmode = (cmd == GFS2_IOCTL_SETFLAGS) ? |
| LM_ST_EXCLUSIVE : LM_ST_SHARED; |
| struct buffer_head *dibh; |
| struct gfs2_holder i_gh; |
| int error; |
| __u32 flags = 0, change; |
| |
| if (cmd == GFS2_IOCTL_SETFLAGS) { |
| error = get_user(flags, (__u32 __user *)arg); |
| if (error) |
| return -EFAULT; |
| } |
| |
| error = gfs2_glock_nq_init(ip->i_gl, lmode, 0, &i_gh); |
| if (error) |
| return error; |
| |
| if (cmd == GFS2_IOCTL_SETFLAGS) { |
| change = flags ^ ip->i_di.di_flags; |
| error = -EPERM; |
| if (change & (GFS2_DIF_IMMUTABLE|GFS2_DIF_APPENDONLY)) { |
| if (!capable(CAP_LINUX_IMMUTABLE)) |
| goto out; |
| } |
| error = -EINVAL; |
| if (flags & (GFS2_DIF_JDATA|GFS2_DIF_DIRECTIO)) { |
| if (!S_ISREG(ip->i_di.di_mode)) |
| goto out; |
| } |
| if (flags & |
| (GFS2_DIF_INHERIT_JDATA|GFS2_DIF_INHERIT_DIRECTIO)) { |
| if (!S_ISDIR(ip->i_di.di_mode)) |
| goto out; |
| } |
| |
| error = gfs2_trans_begin(ip->i_sbd, RES_DINODE, 0); |
| if (error) |
| goto out; |
| |
| error = gfs2_meta_inode_buffer(ip, &dibh); |
| if (error) |
| goto out_trans_end; |
| |
| ip->i_di.di_flags = flags; |
| |
| gfs2_trans_add_bh(ip->i_gl, dibh, 1); |
| gfs2_dinode_out(&ip->i_di, dibh->b_data); |
| |
| brelse(dibh); |
| |
| out_trans_end: |
| gfs2_trans_end(ip->i_sbd); |
| } else { |
| flags = ip->i_di.di_flags; |
| } |
| out: |
| gfs2_glock_dq_uninit(&i_gh); |
| if (cmd == GFS2_IOCTL_GETFLAGS) { |
| if (put_user(flags, (__u32 __user *)arg)) |
| return -EFAULT; |
| } |
| return error; |
| } |
| |
| /** |
| * gfs2_ioctl - do an ioctl on a file |
| * @inode: the inode |
| * @file: the file pointer |
| * @cmd: the ioctl command |
| * @arg: the argument |
| * |
| * Returns: errno |
| */ |
| |
| static int gfs2_ioctl(struct inode *inode, struct file *file, unsigned int cmd, |
| unsigned long arg) |
| { |
| struct gfs2_inode *ip = get_v2ip(inode); |
| |
| switch (cmd) { |
| case GFS2_IOCTL_SETFLAGS: |
| case GFS2_IOCTL_GETFLAGS: |
| return gfs2_ioctl_flags(ip, cmd, arg); |
| |
| default: |
| return -ENOTTY; |
| } |
| } |
| |
| /** |
| * gfs2_mmap - |
| * @file: The file to map |
| * @vma: The VMA which described the mapping |
| * |
| * Returns: 0 or error code |
| */ |
| |
| static int gfs2_mmap(struct file *file, struct vm_area_struct *vma) |
| { |
| struct gfs2_inode *ip = get_v2ip(file->f_mapping->host); |
| struct gfs2_holder i_gh; |
| int error; |
| |
| gfs2_holder_init(ip->i_gl, LM_ST_SHARED, GL_ATIME, &i_gh); |
| error = gfs2_glock_nq_atime(&i_gh); |
| if (error) { |
| gfs2_holder_uninit(&i_gh); |
| return error; |
| } |
| |
| /* This is VM_MAYWRITE instead of VM_WRITE because a call |
| to mprotect() can turn on VM_WRITE later. */ |
| |
| if ((vma->vm_flags & (VM_MAYSHARE | VM_MAYWRITE)) == |
| (VM_MAYSHARE | VM_MAYWRITE)) |
| vma->vm_ops = &gfs2_vm_ops_sharewrite; |
| else |
| vma->vm_ops = &gfs2_vm_ops_private; |
| |
| gfs2_glock_dq_uninit(&i_gh); |
| |
| return error; |
| } |
| |
| /** |
| * gfs2_open - open a file |
| * @inode: the inode to open |
| * @file: the struct file for this opening |
| * |
| * Returns: errno |
| */ |
| |
| static int gfs2_open(struct inode *inode, struct file *file) |
| { |
| struct gfs2_inode *ip = get_v2ip(inode); |
| struct gfs2_holder i_gh; |
| struct gfs2_file *fp; |
| int error; |
| |
| fp = kzalloc(sizeof(struct gfs2_file), GFP_KERNEL); |
| if (!fp) |
| return -ENOMEM; |
| |
| mutex_init(&fp->f_fl_mutex); |
| |
| fp->f_inode = ip; |
| fp->f_vfile = file; |
| |
| gfs2_assert_warn(ip->i_sbd, !get_v2fp(file)); |
| set_v2fp(file, fp); |
| |
| if (S_ISREG(ip->i_di.di_mode)) { |
| error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, |
| &i_gh); |
| if (error) |
| goto fail; |
| |
| if (!(file->f_flags & O_LARGEFILE) && |
| ip->i_di.di_size > MAX_NON_LFS) { |
| error = -EFBIG; |
| goto fail_gunlock; |
| } |
| |
| /* Listen to the Direct I/O flag */ |
| |
| if (ip->i_di.di_flags & GFS2_DIF_DIRECTIO) |
| file->f_flags |= O_DIRECT; |
| |
| gfs2_glock_dq_uninit(&i_gh); |
| } |
| |
| return 0; |
| |
| fail_gunlock: |
| gfs2_glock_dq_uninit(&i_gh); |
| |
| fail: |
| set_v2fp(file, NULL); |
| kfree(fp); |
| |
| return error; |
| } |
| |
| /** |
| * gfs2_close - called to close a struct file |
| * @inode: the inode the struct file belongs to |
| * @file: the struct file being closed |
| * |
| * Returns: errno |
| */ |
| |
| static int gfs2_close(struct inode *inode, struct file *file) |
| { |
| struct gfs2_sbd *sdp = get_v2sdp(inode->i_sb); |
| struct gfs2_file *fp; |
| |
| fp = get_v2fp(file); |
| set_v2fp(file, NULL); |
| |
| if (gfs2_assert_warn(sdp, fp)) |
| return -EIO; |
| |
| kfree(fp); |
| |
| return 0; |
| } |
| |
| /** |
| * gfs2_fsync - sync the dirty data for a file (across the cluster) |
| * @file: the file that points to the dentry (we ignore this) |
| * @dentry: the dentry that points to the inode to sync |
| * |
| * Returns: errno |
| */ |
| |
| static int gfs2_fsync(struct file *file, struct dentry *dentry, int datasync) |
| { |
| struct gfs2_inode *ip = get_v2ip(dentry->d_inode); |
| |
| gfs2_log_flush_glock(ip->i_gl); |
| |
| return 0; |
| } |
| |
| /** |
| * gfs2_lock - acquire/release a posix lock on a file |
| * @file: the file pointer |
| * @cmd: either modify or retrieve lock state, possibly wait |
| * @fl: type and range of lock |
| * |
| * Returns: errno |
| */ |
| |
| static int gfs2_lock(struct file *file, int cmd, struct file_lock *fl) |
| { |
| struct gfs2_inode *ip = get_v2ip(file->f_mapping->host); |
| struct gfs2_sbd *sdp = ip->i_sbd; |
| struct lm_lockname name = |
| { .ln_number = ip->i_num.no_addr, |
| .ln_type = LM_TYPE_PLOCK }; |
| |
| if (!(fl->fl_flags & FL_POSIX)) |
| return -ENOLCK; |
| if ((ip->i_di.di_mode & (S_ISGID | S_IXGRP)) == S_ISGID) |
| return -ENOLCK; |
| |
| if (sdp->sd_args.ar_localflocks) { |
| if (IS_GETLK(cmd)) { |
| struct file_lock *tmp; |
| lock_kernel(); |
| tmp = posix_test_lock(file, fl); |
| fl->fl_type = F_UNLCK; |
| if (tmp) |
| memcpy(fl, tmp, sizeof(struct file_lock)); |
| unlock_kernel(); |
| return 0; |
| } else { |
| int error; |
| lock_kernel(); |
| error = posix_lock_file_wait(file, fl); |
| unlock_kernel(); |
| return error; |
| } |
| } |
| |
| if (IS_GETLK(cmd)) |
| return gfs2_lm_plock_get(sdp, &name, file, fl); |
| else if (fl->fl_type == F_UNLCK) |
| return gfs2_lm_punlock(sdp, &name, file, fl); |
| else |
| return gfs2_lm_plock(sdp, &name, file, cmd, fl); |
| } |
| |
| /** |
| * gfs2_sendfile - Send bytes to a file or socket |
| * @in_file: The file to read from |
| * @out_file: The file to write to |
| * @count: The amount of data |
| * @offset: The beginning file offset |
| * |
| * Outputs: offset - updated according to number of bytes read |
| * |
| * Returns: The number of bytes sent, errno on failure |
| */ |
| |
| static ssize_t gfs2_sendfile(struct file *in_file, loff_t *offset, size_t count, |
| read_actor_t actor, void *target) |
| { |
| return generic_file_sendfile(in_file, offset, count, actor, target); |
| } |
| |
| static int do_flock(struct file *file, int cmd, struct file_lock *fl) |
| { |
| struct gfs2_file *fp = get_v2fp(file); |
| struct gfs2_holder *fl_gh = &fp->f_fl_gh; |
| struct gfs2_inode *ip = fp->f_inode; |
| struct gfs2_glock *gl; |
| unsigned int state; |
| int flags; |
| int error = 0; |
| |
| state = (fl->fl_type == F_WRLCK) ? LM_ST_EXCLUSIVE : LM_ST_SHARED; |
| flags = ((IS_SETLKW(cmd)) ? 0 : LM_FLAG_TRY) | GL_EXACT | GL_NOCACHE; |
| |
| mutex_lock(&fp->f_fl_mutex); |
| |
| gl = fl_gh->gh_gl; |
| if (gl) { |
| if (fl_gh->gh_state == state) |
| goto out; |
| gfs2_glock_hold(gl); |
| flock_lock_file_wait(file, |
| &(struct file_lock){.fl_type = F_UNLCK}); |
| gfs2_glock_dq_uninit(fl_gh); |
| } else { |
| error = gfs2_glock_get(ip->i_sbd, |
| ip->i_num.no_addr, &gfs2_flock_glops, |
| CREATE, &gl); |
| if (error) |
| goto out; |
| } |
| |
| gfs2_holder_init(gl, state, flags, fl_gh); |
| gfs2_glock_put(gl); |
| |
| error = gfs2_glock_nq(fl_gh); |
| if (error) { |
| gfs2_holder_uninit(fl_gh); |
| if (error == GLR_TRYFAILED) |
| error = -EAGAIN; |
| } else { |
| error = flock_lock_file_wait(file, fl); |
| gfs2_assert_warn(ip->i_sbd, !error); |
| } |
| |
| out: |
| mutex_unlock(&fp->f_fl_mutex); |
| |
| return error; |
| } |
| |
| static void do_unflock(struct file *file, struct file_lock *fl) |
| { |
| struct gfs2_file *fp = get_v2fp(file); |
| struct gfs2_holder *fl_gh = &fp->f_fl_gh; |
| |
| mutex_lock(&fp->f_fl_mutex); |
| flock_lock_file_wait(file, fl); |
| if (fl_gh->gh_gl) |
| gfs2_glock_dq_uninit(fl_gh); |
| mutex_unlock(&fp->f_fl_mutex); |
| } |
| |
| /** |
| * gfs2_flock - acquire/release a flock lock on a file |
| * @file: the file pointer |
| * @cmd: either modify or retrieve lock state, possibly wait |
| * @fl: type and range of lock |
| * |
| * Returns: errno |
| */ |
| |
| static int gfs2_flock(struct file *file, int cmd, struct file_lock *fl) |
| { |
| struct gfs2_inode *ip = get_v2ip(file->f_mapping->host); |
| struct gfs2_sbd *sdp = ip->i_sbd; |
| |
| if (!(fl->fl_flags & FL_FLOCK)) |
| return -ENOLCK; |
| if ((ip->i_di.di_mode & (S_ISGID | S_IXGRP)) == S_ISGID) |
| return -ENOLCK; |
| |
| if (sdp->sd_args.ar_localflocks) |
| return flock_lock_file_wait(file, fl); |
| |
| if (fl->fl_type == F_UNLCK) { |
| do_unflock(file, fl); |
| return 0; |
| } else |
| return do_flock(file, cmd, fl); |
| } |
| |
| struct file_operations gfs2_file_fops = { |
| .llseek = gfs2_llseek, |
| .read = gfs2_read, |
| .readv = gfs2_file_readv, |
| .aio_read = gfs2_file_aio_read, |
| .write = generic_file_write, |
| .writev = generic_file_writev, |
| .aio_write = generic_file_aio_write, |
| .ioctl = gfs2_ioctl, |
| .mmap = gfs2_mmap, |
| .open = gfs2_open, |
| .release = gfs2_close, |
| .fsync = gfs2_fsync, |
| .lock = gfs2_lock, |
| .sendfile = gfs2_sendfile, |
| .flock = gfs2_flock, |
| }; |
| |
| struct file_operations gfs2_dir_fops = { |
| .readdir = gfs2_readdir, |
| .ioctl = gfs2_ioctl, |
| .open = gfs2_open, |
| .release = gfs2_close, |
| .fsync = gfs2_fsync, |
| .lock = gfs2_lock, |
| .flock = gfs2_flock, |
| }; |
| |