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6d4ade986f
I've restricted atomic_open to only operate on regular files, although I still don't understand why atomic_open should not be possible also for directories on GFS2. That can always be added in later though, if it makes sense. The ->atomic_open function can be passed negative dentries, which in most cases means either ENOENT (->lookup) or a call to d_instantiate (->create). In the GFS2 case though, we need to actually perform the look up, since we do not know whether there has been a new inode created on another node. The look up calls d_splice_alias which then tries to rehash the dentry - so the solution here is to simply check for that in d_splice_alias. The same issue is likely to affect any other cluster filesystem implementing ->atomic_open Signed-off-by: Steven Whitehouse <swhiteho@redhat.com> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: "J. Bruce Fields" <bfields fieldses org> Cc: Jeff Layton <jlayton@redhat.com>
142 lines
4.3 KiB
C
142 lines
4.3 KiB
C
/*
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* Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
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* Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved.
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*
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* This copyrighted material is made available to anyone wishing to use,
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* modify, copy, or redistribute it subject to the terms and conditions
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* of the GNU General Public License version 2.
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*/
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#ifndef __INODE_DOT_H__
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#define __INODE_DOT_H__
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#include <linux/fs.h>
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#include <linux/buffer_head.h>
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#include <linux/mm.h>
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#include "util.h"
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extern int gfs2_releasepage(struct page *page, gfp_t gfp_mask);
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extern int gfs2_internal_read(struct gfs2_inode *ip,
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char *buf, loff_t *pos, unsigned size);
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extern void gfs2_set_aops(struct inode *inode);
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static inline int gfs2_is_stuffed(const struct gfs2_inode *ip)
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{
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return !ip->i_height;
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}
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static inline int gfs2_is_jdata(const struct gfs2_inode *ip)
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{
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return ip->i_diskflags & GFS2_DIF_JDATA;
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}
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static inline int gfs2_is_writeback(const struct gfs2_inode *ip)
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{
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const struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
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return (sdp->sd_args.ar_data == GFS2_DATA_WRITEBACK) && !gfs2_is_jdata(ip);
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}
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static inline int gfs2_is_ordered(const struct gfs2_inode *ip)
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{
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const struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
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return (sdp->sd_args.ar_data == GFS2_DATA_ORDERED) && !gfs2_is_jdata(ip);
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}
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static inline int gfs2_is_dir(const struct gfs2_inode *ip)
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{
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return S_ISDIR(ip->i_inode.i_mode);
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}
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static inline void gfs2_set_inode_blocks(struct inode *inode, u64 blocks)
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{
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inode->i_blocks = blocks <<
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(GFS2_SB(inode)->sd_sb.sb_bsize_shift - GFS2_BASIC_BLOCK_SHIFT);
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}
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static inline u64 gfs2_get_inode_blocks(const struct inode *inode)
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{
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return inode->i_blocks >>
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(GFS2_SB(inode)->sd_sb.sb_bsize_shift - GFS2_BASIC_BLOCK_SHIFT);
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}
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static inline void gfs2_add_inode_blocks(struct inode *inode, s64 change)
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{
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gfs2_assert(GFS2_SB(inode), (change >= 0 || inode->i_blocks > -change));
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change *= (GFS2_SB(inode)->sd_sb.sb_bsize/GFS2_BASIC_BLOCK);
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inode->i_blocks += change;
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}
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static inline int gfs2_check_inum(const struct gfs2_inode *ip, u64 no_addr,
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u64 no_formal_ino)
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{
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return ip->i_no_addr == no_addr && ip->i_no_formal_ino == no_formal_ino;
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}
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static inline void gfs2_inum_out(const struct gfs2_inode *ip,
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struct gfs2_dirent *dent)
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{
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dent->de_inum.no_formal_ino = cpu_to_be64(ip->i_no_formal_ino);
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dent->de_inum.no_addr = cpu_to_be64(ip->i_no_addr);
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}
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static inline int gfs2_check_internal_file_size(struct inode *inode,
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u64 minsize, u64 maxsize)
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{
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u64 size = i_size_read(inode);
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if (size < minsize || size > maxsize)
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goto err;
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if (size & ((1 << inode->i_blkbits) - 1))
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goto err;
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return 0;
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err:
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gfs2_consist_inode(GFS2_I(inode));
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return -EIO;
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}
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extern struct inode *gfs2_inode_lookup(struct super_block *sb, unsigned type,
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u64 no_addr, u64 no_formal_ino,
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int non_block);
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extern struct inode *gfs2_lookup_by_inum(struct gfs2_sbd *sdp, u64 no_addr,
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u64 *no_formal_ino,
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unsigned int blktype);
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extern struct inode *gfs2_ilookup(struct super_block *sb, u64 no_addr, int nonblock);
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extern int gfs2_inode_refresh(struct gfs2_inode *ip);
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extern struct inode *gfs2_lookupi(struct inode *dir, const struct qstr *name,
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int is_root);
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extern int gfs2_permission(struct inode *inode, int mask);
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extern int gfs2_setattr_simple(struct inode *inode, struct iattr *attr);
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extern struct inode *gfs2_lookup_simple(struct inode *dip, const char *name);
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extern void gfs2_dinode_out(const struct gfs2_inode *ip, void *buf);
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extern int gfs2_open_common(struct inode *inode, struct file *file);
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extern const struct inode_operations gfs2_file_iops;
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extern const struct inode_operations gfs2_dir_iops;
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extern const struct inode_operations gfs2_symlink_iops;
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extern const struct file_operations gfs2_file_fops_nolock;
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extern const struct file_operations gfs2_dir_fops_nolock;
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extern void gfs2_set_inode_flags(struct inode *inode);
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#ifdef CONFIG_GFS2_FS_LOCKING_DLM
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extern const struct file_operations gfs2_file_fops;
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extern const struct file_operations gfs2_dir_fops;
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static inline int gfs2_localflocks(const struct gfs2_sbd *sdp)
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{
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return sdp->sd_args.ar_localflocks;
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}
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#else /* Single node only */
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#define gfs2_file_fops gfs2_file_fops_nolock
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#define gfs2_dir_fops gfs2_dir_fops_nolock
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static inline int gfs2_localflocks(const struct gfs2_sbd *sdp)
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{
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return 1;
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}
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#endif /* CONFIG_GFS2_FS_LOCKING_DLM */
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#endif /* __INODE_DOT_H__ */
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