/* * 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 #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "gfs2.h" #include "lm_interface.h" #include "incore.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" #include "util.h" #include "eaops.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 = file->f_mapping->host->u.generic_ip; 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 = filp->f_mapping->host->u.generic_ip; 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 inode *dir = file->f_mapping->host; struct gfs2_inode *dip = dir->u.generic_ip; 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(dir, &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 inode *dir = file->f_mapping->host; struct gfs2_inode *dip = dir->u.generic_ip; 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(dir, &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 const u32 iflags_to_gfs2[32] = { [iflag_Sync] = GFS2_DIF_SYNC, [iflag_Immutable] = GFS2_DIF_IMMUTABLE, [iflag_Append] = GFS2_DIF_APPENDONLY, [iflag_NoAtime] = GFS2_DIF_NOATIME, [iflag_Index] = GFS2_DIF_EXHASH, [iflag_JournalData] = GFS2_DIF_JDATA, [iflag_DirectIO] = GFS2_DIF_DIRECTIO, [iflag_InheritDirectIO] = GFS2_DIF_INHERIT_DIRECTIO, [iflag_InheritJdata] = GFS2_DIF_INHERIT_JDATA, }; static const u32 gfs2_to_iflags[32] = { [gfs2fl_Sync] = IFLAG_SYNC, [gfs2fl_Immutable] = IFLAG_IMMUTABLE, [gfs2fl_AppendOnly] = IFLAG_APPEND, [gfs2fl_NoAtime] = IFLAG_NOATIME, [gfs2fl_ExHash] = IFLAG_INDEX, [gfs2fl_Jdata] = IFLAG_JOURNAL_DATA, [gfs2fl_Directio] = IFLAG_DIRECTIO, [gfs2fl_InheritDirectio] = IFLAG_INHERITDIRECTIO, [gfs2fl_InheritJdata] = IFLAG_INHERITJDATA, }; static int gfs2_get_flags(struct file *filp, u32 __user *ptr) { struct inode *inode = filp->f_dentry->d_inode; struct gfs2_inode *ip = inode->u.generic_ip; struct gfs2_holder gh; int error; u32 iflags; gfs2_holder_init(ip->i_gl, LM_ST_SHARED, GL_ATIME, &gh); error = gfs2_glock_nq_m_atime(1, &gh); if (error) return error; iflags = iflags_cvt(gfs2_to_iflags, ip->i_di.di_flags); if (put_user(iflags, ptr)) error = -EFAULT; gfs2_glock_dq_m(1, &gh); gfs2_holder_uninit(&gh); return error; } /* Flags that can be set by user space */ #define GFS2_FLAGS_USER_SET (GFS2_DIF_JDATA| \ GFS2_DIF_DIRECTIO| \ GFS2_DIF_IMMUTABLE| \ GFS2_DIF_APPENDONLY| \ GFS2_DIF_NOATIME| \ GFS2_DIF_SYNC| \ GFS2_DIF_SYSTEM| \ GFS2_DIF_INHERIT_DIRECTIO| \ GFS2_DIF_INHERIT_JDATA) /** * gfs2_set_flags - set flags on an inode * @inode: The inode * @flags: The flags to set * @mask: Indicates which flags are valid * */ static int do_gfs2_set_flags(struct file *filp, u32 reqflags, u32 mask) { struct inode *inode = filp->f_dentry->d_inode; struct gfs2_inode *ip = inode->u.generic_ip; struct gfs2_sbd *sdp = ip->i_sbd; struct buffer_head *bh; struct gfs2_holder gh; int error; u32 new_flags, flags; gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh); error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh); if (error) return error; flags = ip->i_di.di_flags; new_flags = (flags & ~mask) | (reqflags & mask); if ((new_flags ^ flags) == 0) goto out; error = -EINVAL; if ((new_flags ^ flags) & ~GFS2_FLAGS_USER_SET) goto out; if (S_ISDIR(inode->i_mode)) { if ((new_flags ^ flags) & (GFS2_DIF_JDATA | GFS2_DIF_DIRECTIO)) goto out; } else if (S_ISREG(inode->i_mode)) { if ((new_flags ^ flags) & (GFS2_DIF_INHERIT_DIRECTIO| GFS2_DIF_INHERIT_JDATA)) goto out; } else goto out; error = -EPERM; if (IS_IMMUTABLE(inode) && (new_flags & GFS2_DIF_IMMUTABLE)) goto out; if (IS_APPEND(inode) && (new_flags & GFS2_DIF_APPENDONLY)) goto out; error = gfs2_repermission(inode, MAY_WRITE, NULL); if (error) goto out; error = gfs2_trans_begin(sdp, RES_DINODE, 0); if (error) goto out; error = gfs2_meta_inode_buffer(ip, &bh); if (error) goto out_trans_end; gfs2_trans_add_bh(ip->i_gl, bh, 1); ip->i_di.di_flags = new_flags; gfs2_dinode_out(&ip->i_di, bh->b_data); brelse(bh); out_trans_end: gfs2_trans_end(sdp); out: gfs2_glock_dq_uninit(&gh); return error; } static int gfs2_set_flags(struct file *filp, u32 __user *ptr) { u32 iflags, gfsflags; if (get_user(iflags, ptr)) return -EFAULT; gfsflags = iflags_cvt(iflags_to_gfs2, iflags); return do_gfs2_set_flags(filp, gfsflags, ~0); } static long gfs2_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) { switch(cmd) { case IFLAGS_GET_IOC: return gfs2_get_flags(filp, (u32 __user *)arg); case IFLAGS_SET_IOC: return gfs2_set_flags(filp, (u32 __user *)arg); } 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 = file->f_mapping->host->u.generic_ip; 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 = inode->u.generic_ip; 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); gfs2_assert_warn(ip->i_sbd, !file->private_data); file->private_data = 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: file->private_data = 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 = inode->i_sb->s_fs_info; struct gfs2_file *fp; fp = file->private_data; file->private_data = 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 = dentry->d_inode->u.generic_ip; gfs2_log_flush(ip->i_gl->gl_sbd, 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 = file->f_mapping->host->u.generic_ip; 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; int ret; ret = posix_test_lock(file, fl, &tmp); fl->fl_type = F_UNLCK; if (ret) memcpy(fl, &tmp, sizeof(struct file_lock)); return 0; } else { return posix_lock_file_wait(file, fl); } } 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 = file->private_data; struct gfs2_holder *fl_gh = &fp->f_fl_gh; struct gfs2_inode *ip = file->f_dentry->d_inode->u.generic_ip; 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 = file->private_data; 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 = file->f_mapping->host->u.generic_ip; 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, .unlocked_ioctl = gfs2_ioctl, .mmap = gfs2_mmap, .open = gfs2_open, .release = gfs2_close, .fsync = gfs2_fsync, .lock = gfs2_lock, .sendfile = gfs2_sendfile, .flock = gfs2_flock, .splice_read = generic_file_splice_read, .splice_write = generic_file_splice_write, }; struct file_operations gfs2_dir_fops = { .readdir = gfs2_readdir, .unlocked_ioctl = gfs2_ioctl, .open = gfs2_open, .release = gfs2_close, .fsync = gfs2_fsync, .lock = gfs2_lock, .flock = gfs2_flock, };