From 8c85e125124a473d6f3e9bb187b0b84207f81d91 Mon Sep 17 00:00:00 2001 From: Christoph Hellwig Date: Tue, 28 Apr 2009 18:00:26 +0200 Subject: remove ->write_super call in generic_shutdown_super We just did a full fs writeout using sync_filesystem before, and if that's not enough for the filesystem it can perform it's own writeout in ->put_super, which many filesystems already do. Move a call to foofs_write_super into every foofs_put_super for now to guarantee identical behaviour until it's cleaned up by the individual filesystem maintainers. Exceptions: - affs already has identical copy & pasted code at the beginning of affs_put_super so no need to do it twice. - xfs does the right thing without it and I have changes pending for the xfs tree touching this are so I don't really need conflicts here.. Signed-off-by: Christoph Hellwig Signed-off-by: Al Viro --- fs/nilfs2/super.c | 4 ++++ 1 file changed, 4 insertions(+) (limited to 'fs/nilfs2/super.c') diff --git a/fs/nilfs2/super.c b/fs/nilfs2/super.c index 6989b03e97ab..7901d8cbb9b1 100644 --- a/fs/nilfs2/super.c +++ b/fs/nilfs2/super.c @@ -65,6 +65,7 @@ MODULE_DESCRIPTION("A New Implementation of the Log-structured Filesystem " "(NILFS)"); MODULE_LICENSE("GPL"); +static void nilfs_write_super(struct super_block *sb); static int nilfs_remount(struct super_block *sb, int *flags, char *data); static int test_exclusive_mount(struct file_system_type *fs_type, struct block_device *bdev, int flags); @@ -315,6 +316,9 @@ static void nilfs_put_super(struct super_block *sb) struct nilfs_sb_info *sbi = NILFS_SB(sb); struct the_nilfs *nilfs = sbi->s_nilfs; + if (sb->s_dirt) + nilfs_write_super(sb); + nilfs_detach_segment_constructor(sbi); if (!(sb->s_flags & MS_RDONLY)) { -- cgit v1.2.3 From 6cfd0148425e528b859b26e436b01f23f6926224 Mon Sep 17 00:00:00 2001 From: Christoph Hellwig Date: Tue, 5 May 2009 15:40:36 +0200 Subject: push BKL down into ->put_super Move BKL into ->put_super from the only caller. A couple of filesystems had trivial enough ->put_super (only kfree and NULLing of s_fs_info + stuff in there) to not get any locking: coda, cramfs, efs, hugetlbfs, omfs, qnx4, shmem, all others got the full treatment. Most of them probably don't need it, but I'd rather sort that out individually. Preferably after all the other BKL pushdowns in that area. [AV: original used to move lock_super() down as well; these changes are removed since we don't do lock_super() at all in generic_shutdown_super() now] [AV: fuse, btrfs and xfs are known to need no damn BKL, exempt] Signed-off-by: Christoph Hellwig Signed-off-by: Al Viro --- fs/adfs/super.c | 4 ++++ fs/affs/super.c | 5 ++++- fs/afs/super.c | 4 ++++ fs/befs/linuxvfs.c | 5 ++++- fs/bfs/inode.c | 4 ++++ fs/cifs/cifsfs.c | 6 +++++- fs/ecryptfs/super.c | 5 +++++ fs/exofs/super.c | 4 ++++ fs/ext2/super.c | 4 +++- fs/ext3/super.c | 5 ++++- fs/ext4/super.c | 2 +- fs/fat/inode.c | 4 ++++ fs/freevxfs/vxfs_super.c | 4 ++++ fs/gfs2/super.c | 4 ++++ fs/hfs/super.c | 4 ++++ fs/hfsplus/super.c | 5 +++++ fs/hpfs/super.c | 5 +++++ fs/isofs/inode.c | 5 +++++ fs/jffs2/super.c | 4 ++++ fs/jfs/super.c | 5 +++++ fs/minix/inode.c | 4 +++- fs/ncpfs/inode.c | 4 ++++ fs/nilfs2/super.c | 4 ++++ fs/ntfs/super.c | 6 +++++- fs/ocfs2/super.c | 4 ++++ fs/reiserfs/super.c | 4 +++- fs/smbfs/inode.c | 4 ++++ fs/squashfs/super.c | 4 ++++ fs/super.c | 3 --- fs/sysv/inode.c | 4 ++++ fs/ubifs/super.c | 5 +++++ fs/udf/super.c | 5 +++++ fs/ufs/super.c | 6 ++++++ 33 files changed, 133 insertions(+), 12 deletions(-) (limited to 'fs/nilfs2/super.c') diff --git a/fs/adfs/super.c b/fs/adfs/super.c index dd9becca4241..0ec5aaf47aa7 100644 --- a/fs/adfs/super.c +++ b/fs/adfs/super.c @@ -132,11 +132,15 @@ static void adfs_put_super(struct super_block *sb) int i; struct adfs_sb_info *asb = ADFS_SB(sb); + lock_kernel(); + for (i = 0; i < asb->s_map_size; i++) brelse(asb->s_map[i].dm_bh); kfree(asb->s_map); kfree(asb); sb->s_fs_info = NULL; + + unlock_kernel(); } static int adfs_show_options(struct seq_file *seq, struct vfsmount *mnt) diff --git a/fs/affs/super.c b/fs/affs/super.c index 63f5183f263b..d7386462a8e7 100644 --- a/fs/affs/super.c +++ b/fs/affs/super.c @@ -29,6 +29,8 @@ affs_put_super(struct super_block *sb) struct affs_sb_info *sbi = AFFS_SB(sb); pr_debug("AFFS: put_super()\n"); + lock_kernel(); + if (!(sb->s_flags & MS_RDONLY)) { AFFS_ROOT_TAIL(sb, sbi->s_root_bh)->bm_flag = cpu_to_be32(1); secs_to_datestamp(get_seconds(), @@ -42,7 +44,8 @@ affs_put_super(struct super_block *sb) affs_brelse(sbi->s_root_bh); kfree(sbi); sb->s_fs_info = NULL; - return; + + unlock_kernel(); } static void diff --git a/fs/afs/super.c b/fs/afs/super.c index 76828e5f8a39..ad0514d0115f 100644 --- a/fs/afs/super.c +++ b/fs/afs/super.c @@ -440,8 +440,12 @@ static void afs_put_super(struct super_block *sb) _enter(""); + lock_kernel(); + afs_put_volume(as->volume); + unlock_kernel(); + _leave(""); } diff --git a/fs/befs/linuxvfs.c b/fs/befs/linuxvfs.c index 76afd0d6b86c..9367b6297d84 100644 --- a/fs/befs/linuxvfs.c +++ b/fs/befs/linuxvfs.c @@ -737,6 +737,8 @@ parse_options(char *options, befs_mount_options * opts) static void befs_put_super(struct super_block *sb) { + lock_kernel(); + kfree(BEFS_SB(sb)->mount_opts.iocharset); BEFS_SB(sb)->mount_opts.iocharset = NULL; @@ -747,7 +749,8 @@ befs_put_super(struct super_block *sb) kfree(sb->s_fs_info); sb->s_fs_info = NULL; - return; + + unlock_kernel(); } /* Allocate private field of the superblock, fill it. diff --git a/fs/bfs/inode.c b/fs/bfs/inode.c index 4cf3d269e271..3a9a1361fdc1 100644 --- a/fs/bfs/inode.c +++ b/fs/bfs/inode.c @@ -217,6 +217,8 @@ static void bfs_put_super(struct super_block *s) if (!info) return; + lock_kernel(); + if (s->s_dirt) bfs_write_super(s); @@ -225,6 +227,8 @@ static void bfs_put_super(struct super_block *s) kfree(info->si_imap); kfree(info); s->s_fs_info = NULL; + + unlock_kernel(); } static int bfs_statfs(struct dentry *dentry, struct kstatfs *buf) diff --git a/fs/cifs/cifsfs.c b/fs/cifs/cifsfs.c index 0a10a59b6392..0d92114195ab 100644 --- a/fs/cifs/cifsfs.c +++ b/fs/cifs/cifsfs.c @@ -204,6 +204,9 @@ cifs_put_super(struct super_block *sb) cFYI(1, ("Empty cifs superblock info passed to unmount")); return; } + + lock_kernel(); + rc = cifs_umount(sb, cifs_sb); if (rc) cERROR(1, ("cifs_umount failed with return code %d", rc)); @@ -216,7 +219,8 @@ cifs_put_super(struct super_block *sb) unload_nls(cifs_sb->local_nls); kfree(cifs_sb); - return; + + unlock_kernel(); } static int diff --git a/fs/ecryptfs/super.c b/fs/ecryptfs/super.c index fa4c7e7d15d9..12d649602d3a 100644 --- a/fs/ecryptfs/super.c +++ b/fs/ecryptfs/super.c @@ -27,6 +27,7 @@ #include #include #include +#include #include #include #include "ecryptfs_kernel.h" @@ -120,9 +121,13 @@ static void ecryptfs_put_super(struct super_block *sb) { struct ecryptfs_sb_info *sb_info = ecryptfs_superblock_to_private(sb); + lock_kernel(); + ecryptfs_destroy_mount_crypt_stat(&sb_info->mount_crypt_stat); kmem_cache_free(ecryptfs_sb_info_cache, sb_info); ecryptfs_set_superblock_private(sb, NULL); + + unlock_kernel(); } /** diff --git a/fs/exofs/super.c b/fs/exofs/super.c index 3cdb761db8ad..cd1f8b18a218 100644 --- a/fs/exofs/super.c +++ b/fs/exofs/super.c @@ -258,6 +258,8 @@ static void exofs_put_super(struct super_block *sb) int num_pend; struct exofs_sb_info *sbi = sb->s_fs_info; + lock_kernel(); + if (sb->s_dirt) exofs_write_super(sb); @@ -274,6 +276,8 @@ static void exofs_put_super(struct super_block *sb) osduld_put_device(sbi->s_dev); kfree(sb->s_fs_info); sb->s_fs_info = NULL; + + unlock_kernel(); } /* diff --git a/fs/ext2/super.c b/fs/ext2/super.c index 932a2bcb6908..a44963d8edbd 100644 --- a/fs/ext2/super.c +++ b/fs/ext2/super.c @@ -114,6 +114,8 @@ static void ext2_put_super (struct super_block * sb) int i; struct ext2_sb_info *sbi = EXT2_SB(sb); + lock_kernel(); + if (sb->s_dirt) ext2_write_super(sb); @@ -138,7 +140,7 @@ static void ext2_put_super (struct super_block * sb) kfree(sbi->s_blockgroup_lock); kfree(sbi); - return; + unlock_kernel(); } static struct kmem_cache * ext2_inode_cachep; diff --git a/fs/ext3/super.c b/fs/ext3/super.c index 1efd958687e9..546b8d732bf2 100644 --- a/fs/ext3/super.c +++ b/fs/ext3/super.c @@ -398,6 +398,8 @@ static void ext3_put_super (struct super_block * sb) struct ext3_super_block *es = sbi->s_es; int i, err; + lock_kernel(); + ext3_xattr_put_super(sb); err = journal_destroy(sbi->s_journal); sbi->s_journal = NULL; @@ -446,7 +448,8 @@ static void ext3_put_super (struct super_block * sb) sb->s_fs_info = NULL; kfree(sbi->s_blockgroup_lock); kfree(sbi); - return; + + unlock_kernel(); } static struct kmem_cache *ext3_inode_cachep; diff --git a/fs/ext4/super.c b/fs/ext4/super.c index 0d3034c5e8a4..1d4180b86772 100644 --- a/fs/ext4/super.c +++ b/fs/ext4/super.c @@ -577,6 +577,7 @@ static void ext4_put_super(struct super_block *sb) int i, err; lock_super(sb); + lock_kernel(); if (sb->s_dirt) ext4_write_super(sb); @@ -646,7 +647,6 @@ static void ext4_put_super(struct super_block *sb) unlock_super(sb); kobject_put(&sbi->s_kobj); wait_for_completion(&sbi->s_kobj_unregister); - lock_kernel(); kfree(sbi->s_blockgroup_lock); kfree(sbi); } diff --git a/fs/fat/inode.c b/fs/fat/inode.c index 4978621511bf..2b88c93af227 100644 --- a/fs/fat/inode.c +++ b/fs/fat/inode.c @@ -451,6 +451,8 @@ static void fat_put_super(struct super_block *sb) { struct msdos_sb_info *sbi = MSDOS_SB(sb); + lock_kernel(); + if (sb->s_dirt) fat_write_super(sb); @@ -470,6 +472,8 @@ static void fat_put_super(struct super_block *sb) sb->s_fs_info = NULL; kfree(sbi); + + unlock_kernel(); } static struct kmem_cache *fat_inode_cachep; diff --git a/fs/freevxfs/vxfs_super.c b/fs/freevxfs/vxfs_super.c index 1dacda831577..cdbd1654e4cd 100644 --- a/fs/freevxfs/vxfs_super.c +++ b/fs/freevxfs/vxfs_super.c @@ -80,12 +80,16 @@ vxfs_put_super(struct super_block *sbp) { struct vxfs_sb_info *infp = VXFS_SBI(sbp); + lock_kernel(); + vxfs_put_fake_inode(infp->vsi_fship); vxfs_put_fake_inode(infp->vsi_ilist); vxfs_put_fake_inode(infp->vsi_stilist); brelse(infp->vsi_bp); kfree(infp); + + unlock_kernel(); } /** diff --git a/fs/gfs2/super.c b/fs/gfs2/super.c index 0a6801336470..c8930b31cdf0 100644 --- a/fs/gfs2/super.c +++ b/fs/gfs2/super.c @@ -719,6 +719,8 @@ static void gfs2_put_super(struct super_block *sb) int error; struct gfs2_jdesc *jd; + lock_kernel(); + /* Unfreeze the filesystem, if we need to */ mutex_lock(&sdp->sd_freeze_lock); @@ -785,6 +787,8 @@ restart: /* At this point, we're through participating in the lockspace */ gfs2_sys_fs_del(sdp); + + unlock_kernel(); } /** diff --git a/fs/hfs/super.c b/fs/hfs/super.c index e071e6d06463..9f5eaa01cc77 100644 --- a/fs/hfs/super.c +++ b/fs/hfs/super.c @@ -65,11 +65,15 @@ static void hfs_write_super(struct super_block *sb) */ static void hfs_put_super(struct super_block *sb) { + lock_kernel(); + if (sb->s_dirt) hfs_write_super(sb); hfs_mdb_close(sb); /* release the MDB's resources */ hfs_mdb_put(sb); + + unlock_kernel(); } /* diff --git a/fs/hfsplus/super.c b/fs/hfsplus/super.c index 40bdab79dae8..9b292dcc39c8 100644 --- a/fs/hfsplus/super.c +++ b/fs/hfsplus/super.c @@ -199,6 +199,9 @@ static void hfsplus_put_super(struct super_block *sb) dprint(DBG_SUPER, "hfsplus_put_super\n"); if (!sb->s_fs_info) return; + + lock_kernel(); + if (sb->s_dirt) hfsplus_write_super(sb); if (!(sb->s_flags & MS_RDONLY) && HFSPLUS_SB(sb).s_vhdr) { @@ -220,6 +223,8 @@ static void hfsplus_put_super(struct super_block *sb) unload_nls(HFSPLUS_SB(sb).nls); kfree(sb->s_fs_info); sb->s_fs_info = NULL; + + unlock_kernel(); } static int hfsplus_statfs(struct dentry *dentry, struct kstatfs *buf) diff --git a/fs/hpfs/super.c b/fs/hpfs/super.c index fc77965be841..437a32e9deac 100644 --- a/fs/hpfs/super.c +++ b/fs/hpfs/super.c @@ -99,11 +99,16 @@ int hpfs_stop_cycles(struct super_block *s, int key, int *c1, int *c2, static void hpfs_put_super(struct super_block *s) { struct hpfs_sb_info *sbi = hpfs_sb(s); + + lock_kernel(); + kfree(sbi->sb_cp_table); kfree(sbi->sb_bmp_dir); unmark_dirty(s); s->s_fs_info = NULL; kfree(sbi); + + unlock_kernel(); } unsigned hpfs_count_one_bitmap(struct super_block *s, secno secno) diff --git a/fs/isofs/inode.c b/fs/isofs/inode.c index b4cbe9603c7d..068b34b5a107 100644 --- a/fs/isofs/inode.c +++ b/fs/isofs/inode.c @@ -42,11 +42,16 @@ static int isofs_dentry_cmp_ms(struct dentry *dentry, struct qstr *a, struct qst static void isofs_put_super(struct super_block *sb) { struct isofs_sb_info *sbi = ISOFS_SB(sb); + #ifdef CONFIG_JOLIET + lock_kernel(); + if (sbi->s_nls_iocharset) { unload_nls(sbi->s_nls_iocharset); sbi->s_nls_iocharset = NULL; } + + unlock_kernel(); #endif kfree(sbi); diff --git a/fs/jffs2/super.c b/fs/jffs2/super.c index 5059e9633edb..37b12125c127 100644 --- a/fs/jffs2/super.c +++ b/fs/jffs2/super.c @@ -174,6 +174,8 @@ static void jffs2_put_super (struct super_block *sb) D2(printk(KERN_DEBUG "jffs2: jffs2_put_super()\n")); + lock_kernel(); + if (sb->s_dirt) jffs2_write_super(sb); @@ -195,6 +197,8 @@ static void jffs2_put_super (struct super_block *sb) if (c->mtd->sync) c->mtd->sync(c->mtd); + unlock_kernel(); + D1(printk(KERN_DEBUG "jffs2_put_super returning\n")); } diff --git a/fs/jfs/super.c b/fs/jfs/super.c index d9b0e92b3602..3eb13adf3862 100644 --- a/fs/jfs/super.c +++ b/fs/jfs/super.c @@ -183,6 +183,9 @@ static void jfs_put_super(struct super_block *sb) int rc; jfs_info("In jfs_put_super"); + + lock_kernel(); + rc = jfs_umount(sb); if (rc) jfs_err("jfs_umount failed with return code %d", rc); @@ -195,6 +198,8 @@ static void jfs_put_super(struct super_block *sb) sbi->direct_inode = NULL; kfree(sbi); + + unlock_kernel(); } enum { diff --git a/fs/minix/inode.c b/fs/minix/inode.c index daad3c2740db..7eb53970f4bc 100644 --- a/fs/minix/inode.c +++ b/fs/minix/inode.c @@ -35,6 +35,8 @@ static void minix_put_super(struct super_block *sb) int i; struct minix_sb_info *sbi = minix_sb(sb); + lock_kernel(); + if (!(sb->s_flags & MS_RDONLY)) { if (sbi->s_version != MINIX_V3) /* s_state is now out from V3 sb */ sbi->s_ms->s_state = sbi->s_mount_state; @@ -49,7 +51,7 @@ static void minix_put_super(struct super_block *sb) sb->s_fs_info = NULL; kfree(sbi); - return; + unlock_kernel(); } static struct kmem_cache * minix_inode_cachep; diff --git a/fs/ncpfs/inode.c b/fs/ncpfs/inode.c index d642f0e5b365..b99ce205b1bd 100644 --- a/fs/ncpfs/inode.c +++ b/fs/ncpfs/inode.c @@ -736,6 +736,8 @@ static void ncp_put_super(struct super_block *sb) { struct ncp_server *server = NCP_SBP(sb); + lock_kernel(); + ncp_lock_server(server); ncp_disconnect(server); ncp_unlock_server(server); @@ -769,6 +771,8 @@ static void ncp_put_super(struct super_block *sb) vfree(server->packet); sb->s_fs_info = NULL; kfree(server); + + unlock_kernel(); } static int ncp_statfs(struct dentry *dentry, struct kstatfs *buf) diff --git a/fs/nilfs2/super.c b/fs/nilfs2/super.c index 7901d8cbb9b1..7262e8427c20 100644 --- a/fs/nilfs2/super.c +++ b/fs/nilfs2/super.c @@ -316,6 +316,8 @@ static void nilfs_put_super(struct super_block *sb) struct nilfs_sb_info *sbi = NILFS_SB(sb); struct the_nilfs *nilfs = sbi->s_nilfs; + lock_kernel(); + if (sb->s_dirt) nilfs_write_super(sb); @@ -333,6 +335,8 @@ static void nilfs_put_super(struct super_block *sb) sbi->s_super = NULL; sb->s_fs_info = NULL; kfree(sbi); + + unlock_kernel(); } /** diff --git a/fs/ntfs/super.c b/fs/ntfs/super.c index 6aa7c4713536..a9ec4e1084e4 100644 --- a/fs/ntfs/super.c +++ b/fs/ntfs/super.c @@ -2246,6 +2246,9 @@ static void ntfs_put_super(struct super_block *sb) ntfs_volume *vol = NTFS_SB(sb); ntfs_debug("Entering."); + + lock_kernel(); + #ifdef NTFS_RW /* * Commit all inodes while they are still open in case some of them @@ -2444,7 +2447,8 @@ static void ntfs_put_super(struct super_block *sb) } sb->s_fs_info = NULL; kfree(vol); - return; + + unlock_kernel(); } /** diff --git a/fs/ocfs2/super.c b/fs/ocfs2/super.c index 3eb076ce4c07..02737596b597 100644 --- a/fs/ocfs2/super.c +++ b/fs/ocfs2/super.c @@ -1536,9 +1536,13 @@ static void ocfs2_put_super(struct super_block *sb) { mlog_entry("(0x%p)\n", sb); + lock_kernel(); + ocfs2_sync_blockdev(sb); ocfs2_dismount_volume(sb, 0); + unlock_kernel(); + mlog_exit_void(); } diff --git a/fs/reiserfs/super.c b/fs/reiserfs/super.c index 3da0401c0a96..90dcb7b033ea 100644 --- a/fs/reiserfs/super.c +++ b/fs/reiserfs/super.c @@ -465,6 +465,8 @@ static void reiserfs_put_super(struct super_block *s) struct reiserfs_transaction_handle th; th.t_trans_id = 0; + lock_kernel(); + if (s->s_dirt) reiserfs_write_super(s); @@ -500,7 +502,7 @@ static void reiserfs_put_super(struct super_block *s) kfree(s->s_fs_info); s->s_fs_info = NULL; - return; + unlock_kernel(); } static struct kmem_cache *reiserfs_inode_cachep; diff --git a/fs/smbfs/inode.c b/fs/smbfs/inode.c index fc27fbfc5397..1402d2d54f52 100644 --- a/fs/smbfs/inode.c +++ b/fs/smbfs/inode.c @@ -474,6 +474,8 @@ smb_put_super(struct super_block *sb) { struct smb_sb_info *server = SMB_SB(sb); + lock_kernel(); + smb_lock_server(server); server->state = CONN_INVALID; smbiod_unregister_server(server); @@ -489,6 +491,8 @@ smb_put_super(struct super_block *sb) smb_unlock_server(server); put_pid(server->conn_pid); kfree(server); + + unlock_kernel(); } static int smb_fill_super(struct super_block *sb, void *raw_data, int silent) diff --git a/fs/squashfs/super.c b/fs/squashfs/super.c index 0adc624c956f..3b52770f46ff 100644 --- a/fs/squashfs/super.c +++ b/fs/squashfs/super.c @@ -338,6 +338,8 @@ static int squashfs_remount(struct super_block *sb, int *flags, char *data) static void squashfs_put_super(struct super_block *sb) { + lock_kernel(); + if (sb->s_fs_info) { struct squashfs_sb_info *sbi = sb->s_fs_info; squashfs_cache_delete(sbi->block_cache); @@ -350,6 +352,8 @@ static void squashfs_put_super(struct super_block *sb) kfree(sb->s_fs_info); sb->s_fs_info = NULL; } + + unlock_kernel(); } diff --git a/fs/super.c b/fs/super.c index 54fd331f0cab..bdd7158b785e 100644 --- a/fs/super.c +++ b/fs/super.c @@ -309,7 +309,6 @@ void generic_shutdown_super(struct super_block *sb) /* bad name - it should be evict_inodes() */ invalidate_inodes(sb); - lock_kernel(); if (sop->put_super) sop->put_super(sb); @@ -320,8 +319,6 @@ void generic_shutdown_super(struct super_block *sb) "Self-destruct in 5 seconds. Have a nice day...\n", sb->s_id); } - - unlock_kernel(); put_fs_excl(); } spin_lock(&sb_lock); diff --git a/fs/sysv/inode.c b/fs/sysv/inode.c index cd80316302cc..a8189864c241 100644 --- a/fs/sysv/inode.c +++ b/fs/sysv/inode.c @@ -72,6 +72,8 @@ static void sysv_put_super(struct super_block *sb) { struct sysv_sb_info *sbi = SYSV_SB(sb); + lock_kernel(); + if (sb->s_dirt) sysv_write_super(sb); @@ -87,6 +89,8 @@ static void sysv_put_super(struct super_block *sb) brelse(sbi->s_bh2); kfree(sbi); + + unlock_kernel(); } static int sysv_statfs(struct dentry *dentry, struct kstatfs *buf) diff --git a/fs/ubifs/super.c b/fs/ubifs/super.c index 84f3c7fd1552..522c3fd7eb3c 100644 --- a/fs/ubifs/super.c +++ b/fs/ubifs/super.c @@ -1684,6 +1684,9 @@ static void ubifs_put_super(struct super_block *sb) ubifs_msg("un-mount UBI device %d, volume %d", c->vi.ubi_num, c->vi.vol_id); + + lock_kernel(); + /* * The following asserts are only valid if there has not been a failure * of the media. For example, there will be dirty inodes if we failed @@ -1750,6 +1753,8 @@ static void ubifs_put_super(struct super_block *sb) ubi_close_volume(c->ubi); mutex_unlock(&c->umount_mutex); kfree(c); + + unlock_kernel(); } static int ubifs_remount_fs(struct super_block *sb, int *flags, char *data) diff --git a/fs/udf/super.c b/fs/udf/super.c index 0ba44107d8f1..04802cc39b18 100644 --- a/fs/udf/super.c +++ b/fs/udf/super.c @@ -2062,6 +2062,9 @@ static void udf_put_super(struct super_block *sb) struct udf_sb_info *sbi; sbi = UDF_SB(sb); + + lock_kernel(); + if (sbi->s_vat_inode) iput(sbi->s_vat_inode); if (sbi->s_partitions) @@ -2077,6 +2080,8 @@ static void udf_put_super(struct super_block *sb) kfree(sbi->s_partmaps); kfree(sb->s_fs_info); sb->s_fs_info = NULL; + + unlock_kernel(); } static int udf_sync_fs(struct super_block *sb, int wait) diff --git a/fs/ufs/super.c b/fs/ufs/super.c index 74afb9fbf58e..2b4d2b6234df 100644 --- a/fs/ufs/super.c +++ b/fs/ufs/super.c @@ -594,6 +594,9 @@ static void ufs_put_super_internal(struct super_block *sb) UFSD("ENTER\n"); + + lock_kernel(); + ufs_put_cstotal(sb); size = uspi->s_cssize; blks = (size + uspi->s_fsize - 1) >> uspi->s_fshift; @@ -621,6 +624,9 @@ static void ufs_put_super_internal(struct super_block *sb) brelse (sbi->s_ucg[i]); kfree (sbi->s_ucg); kfree (base); + + unlock_kernel(); + UFSD("EXIT\n"); } -- cgit v1.2.3 From 337eb00a2c3a421999c39c94ce7e33545ee8baa7 Mon Sep 17 00:00:00 2001 From: Alessio Igor Bogani Date: Tue, 12 May 2009 15:10:54 +0200 Subject: Push BKL down into ->remount_fs() [xfs, btrfs, capifs, shmem don't need BKL, exempt] Signed-off-by: Alessio Igor Bogani Signed-off-by: Al Viro --- drivers/usb/core/inode.c | 5 +++++ fs/affs/super.c | 7 ++++++- fs/ext2/super.c | 12 ++++++++++-- fs/ext3/super.c | 4 ++++ fs/ext4/super.c | 4 ++++ fs/hpfs/super.c | 4 ++++ fs/jffs2/fs.c | 3 +++ fs/jfs/super.c | 22 ++++++++++++++++++---- fs/nfs/super.c | 2 ++ fs/nilfs2/super.c | 4 ++++ fs/ntfs/super.c | 15 ++++++++++++++- fs/ocfs2/super.c | 4 ++++ fs/reiserfs/super.c | 4 ++++ fs/super.c | 2 -- fs/ubifs/super.c | 9 ++++++++- fs/udf/super.c | 6 +++++- fs/ufs/super.c | 11 ++++++++++- kernel/cgroup.c | 3 +++ 18 files changed, 108 insertions(+), 13 deletions(-) (limited to 'fs/nilfs2/super.c') diff --git a/drivers/usb/core/inode.c b/drivers/usb/core/inode.c index dff5760a37f6..ffe75e83787c 100644 --- a/drivers/usb/core/inode.c +++ b/drivers/usb/core/inode.c @@ -39,6 +39,7 @@ #include #include #include +#include #include #include "usb.h" #include "hcd.h" @@ -265,9 +266,13 @@ static int remount(struct super_block *sb, int *flags, char *data) return -EINVAL; } + lock_kernel(); + if (usbfs_mount && usbfs_mount->mnt_sb) update_sb(usbfs_mount->mnt_sb); + unlock_kernel(); + return 0; } diff --git a/fs/affs/super.c b/fs/affs/super.c index 280d361af41f..c4814937c968 100644 --- a/fs/affs/super.c +++ b/fs/affs/super.c @@ -16,6 +16,7 @@ #include #include #include +#include #include "affs.h" extern struct timezone sys_tz; @@ -512,6 +513,7 @@ affs_remount(struct super_block *sb, int *flags, char *data) kfree(new_opts); return -EINVAL; } + lock_kernel(); replace_mount_options(sb, new_opts); sbi->s_flags = mount_flags; @@ -519,8 +521,10 @@ affs_remount(struct super_block *sb, int *flags, char *data) sbi->s_uid = uid; sbi->s_gid = gid; - if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY)) + if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY)) { + unlock_kernel(); return 0; + } if (*flags & MS_RDONLY) { sb->s_dirt = 1; while (sb->s_dirt) @@ -529,6 +533,7 @@ affs_remount(struct super_block *sb, int *flags, char *data) } else res = affs_init_bitmap(sb, flags); + unlock_kernel(); return res; } diff --git a/fs/ext2/super.c b/fs/ext2/super.c index a44963d8edbd..f8cbdf569190 100644 --- a/fs/ext2/super.c +++ b/fs/ext2/super.c @@ -1162,6 +1162,8 @@ static int ext2_remount (struct super_block * sb, int * flags, char * data) unsigned long old_sb_flags; int err; + lock_kernel(); + /* Store the old options */ old_sb_flags = sb->s_flags; old_opts.s_mount_opt = sbi->s_mount_opt; @@ -1197,12 +1199,16 @@ static int ext2_remount (struct super_block * sb, int * flags, char * data) sbi->s_mount_opt &= ~EXT2_MOUNT_XIP; sbi->s_mount_opt |= old_mount_opt & EXT2_MOUNT_XIP; } - if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY)) + if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY)) { + unlock_kernel(); return 0; + } if (*flags & MS_RDONLY) { if (le16_to_cpu(es->s_state) & EXT2_VALID_FS || - !(sbi->s_mount_state & EXT2_VALID_FS)) + !(sbi->s_mount_state & EXT2_VALID_FS)) { + unlock_kernel(); return 0; + } /* * OK, we are remounting a valid rw partition rdonly, so set * the rdonly flag and then mark the partition as valid again. @@ -1229,12 +1235,14 @@ static int ext2_remount (struct super_block * sb, int * flags, char * data) sb->s_flags &= ~MS_RDONLY; } ext2_sync_super(sb, es); + unlock_kernel(); return 0; restore_opts: sbi->s_mount_opt = old_opts.s_mount_opt; sbi->s_resuid = old_opts.s_resuid; sbi->s_resgid = old_opts.s_resgid; sb->s_flags = old_sb_flags; + unlock_kernel(); return err; } diff --git a/fs/ext3/super.c b/fs/ext3/super.c index e213a2613a56..26aa64dee6aa 100644 --- a/fs/ext3/super.c +++ b/fs/ext3/super.c @@ -2490,6 +2490,8 @@ static int ext3_remount (struct super_block * sb, int * flags, char * data) int i; #endif + lock_kernel(); + /* Store the original options */ lock_super(sb); old_sb_flags = sb->s_flags; @@ -2600,6 +2602,7 @@ static int ext3_remount (struct super_block * sb, int * flags, char * data) kfree(old_opts.s_qf_names[i]); #endif unlock_super(sb); + unlock_kernel(); return 0; restore_opts: sb->s_flags = old_sb_flags; @@ -2617,6 +2620,7 @@ restore_opts: } #endif unlock_super(sb); + unlock_kernel(); return err; } diff --git a/fs/ext4/super.c b/fs/ext4/super.c index c17200a42301..012c4251397e 100644 --- a/fs/ext4/super.c +++ b/fs/ext4/super.c @@ -3422,6 +3422,8 @@ static int ext4_remount(struct super_block *sb, int *flags, char *data) int i; #endif + lock_kernel(); + /* Store the original options */ lock_super(sb); old_sb_flags = sb->s_flags; @@ -3558,6 +3560,7 @@ static int ext4_remount(struct super_block *sb, int *flags, char *data) kfree(old_opts.s_qf_names[i]); #endif unlock_super(sb); + unlock_kernel(); return 0; restore_opts: @@ -3578,6 +3581,7 @@ restore_opts: } #endif unlock_super(sb); + unlock_kernel(); return err; } diff --git a/fs/hpfs/super.c b/fs/hpfs/super.c index f68193cf0811..f2feaa06bf26 100644 --- a/fs/hpfs/super.c +++ b/fs/hpfs/super.c @@ -13,6 +13,7 @@ #include #include #include +#include /* Mark the filesystem dirty, so that chkdsk checks it when os/2 booted */ @@ -398,6 +399,7 @@ static int hpfs_remount_fs(struct super_block *s, int *flags, char *data) *flags |= MS_NOATIME; + lock_kernel(); lock_super(s); uid = sbi->sb_uid; gid = sbi->sb_gid; umask = 0777 & ~sbi->sb_mode; @@ -432,10 +434,12 @@ static int hpfs_remount_fs(struct super_block *s, int *flags, char *data) replace_mount_options(s, new_opts); unlock_super(s); + unlock_kernel(); return 0; out_err: unlock_super(s); + unlock_kernel(); kfree(new_opts); return -EINVAL; } diff --git a/fs/jffs2/fs.c b/fs/jffs2/fs.c index 237b27a3d570..3451a81b2142 100644 --- a/fs/jffs2/fs.c +++ b/fs/jffs2/fs.c @@ -20,6 +20,7 @@ #include #include #include +#include #include "nodelist.h" static int jffs2_flash_setup(struct jffs2_sb_info *c); @@ -387,6 +388,7 @@ int jffs2_remount_fs (struct super_block *sb, int *flags, char *data) This also catches the case where it was stopped and this is just a remount to restart it. Flush the writebuffer, if neccecary, else we loose it */ + lock_kernel(); if (!(sb->s_flags & MS_RDONLY)) { jffs2_stop_garbage_collect_thread(c); mutex_lock(&c->alloc_sem); @@ -399,6 +401,7 @@ int jffs2_remount_fs (struct super_block *sb, int *flags, char *data) *flags |= MS_NOATIME; + unlock_kernel(); return 0; } diff --git a/fs/jfs/super.c b/fs/jfs/super.c index 3eb13adf3862..09b1b6ee2186 100644 --- a/fs/jfs/super.c +++ b/fs/jfs/super.c @@ -32,6 +32,7 @@ #include #include #include +#include #include "jfs_incore.h" #include "jfs_filsys.h" @@ -375,19 +376,24 @@ static int jfs_remount(struct super_block *sb, int *flags, char *data) s64 newLVSize = 0; int rc = 0; int flag = JFS_SBI(sb)->flag; + int ret; if (!parse_options(data, sb, &newLVSize, &flag)) { return -EINVAL; } + lock_kernel(); if (newLVSize) { if (sb->s_flags & MS_RDONLY) { printk(KERN_ERR "JFS: resize requires volume to be mounted read-write\n"); + unlock_kernel(); return -EROFS; } rc = jfs_extendfs(sb, newLVSize, 0); - if (rc) + if (rc) { + unlock_kernel(); return rc; + } } if ((sb->s_flags & MS_RDONLY) && !(*flags & MS_RDONLY)) { @@ -398,23 +404,31 @@ static int jfs_remount(struct super_block *sb, int *flags, char *data) truncate_inode_pages(JFS_SBI(sb)->direct_inode->i_mapping, 0); JFS_SBI(sb)->flag = flag; - return jfs_mount_rw(sb, 1); + ret = jfs_mount_rw(sb, 1); + unlock_kernel(); + return ret; } if ((!(sb->s_flags & MS_RDONLY)) && (*flags & MS_RDONLY)) { rc = jfs_umount_rw(sb); JFS_SBI(sb)->flag = flag; + unlock_kernel(); return rc; } if ((JFS_SBI(sb)->flag & JFS_NOINTEGRITY) != (flag & JFS_NOINTEGRITY)) if (!(sb->s_flags & MS_RDONLY)) { rc = jfs_umount_rw(sb); - if (rc) + if (rc) { + unlock_kernel(); return rc; + } JFS_SBI(sb)->flag = flag; - return jfs_mount_rw(sb, 1); + ret = jfs_mount_rw(sb, 1); + unlock_kernel(); + return ret; } JFS_SBI(sb)->flag = flag; + unlock_kernel(); return 0; } diff --git a/fs/nfs/super.c b/fs/nfs/super.c index d2d67781c579..26127b69a275 100644 --- a/fs/nfs/super.c +++ b/fs/nfs/super.c @@ -1813,6 +1813,7 @@ nfs_remount(struct super_block *sb, int *flags, char *raw_data) if (data == NULL) return -ENOMEM; + lock_kernel(); /* fill out struct with values from existing mount */ data->flags = nfss->flags; data->rsize = nfss->rsize; @@ -1837,6 +1838,7 @@ nfs_remount(struct super_block *sb, int *flags, char *raw_data) error = nfs_compare_remount_data(nfss, data); out: kfree(data); + unlock_kernel(); return error; } diff --git a/fs/nilfs2/super.c b/fs/nilfs2/super.c index 7262e8427c20..11151eaa2c4a 100644 --- a/fs/nilfs2/super.c +++ b/fs/nilfs2/super.c @@ -906,6 +906,8 @@ static int nilfs_remount(struct super_block *sb, int *flags, char *data) struct nilfs_mount_options old_opts; int err; + lock_kernel(); + old_sb_flags = sb->s_flags; old_opts.mount_opt = sbi->s_mount_opt; old_opts.snapshot_cno = sbi->s_snapshot_cno; @@ -985,6 +987,7 @@ static int nilfs_remount(struct super_block *sb, int *flags, char *data) up(&sb->s_bdev->bd_mount_sem); } out: + unlock_kernel(); return 0; rw_remount_failed: @@ -993,6 +996,7 @@ static int nilfs_remount(struct super_block *sb, int *flags, char *data) sb->s_flags = old_sb_flags; sbi->s_mount_opt = old_opts.mount_opt; sbi->s_snapshot_cno = old_opts.snapshot_cno; + unlock_kernel(); return err; } diff --git a/fs/ntfs/super.c b/fs/ntfs/super.c index 7a7b0d326395..abaaa1cbf8de 100644 --- a/fs/ntfs/super.c +++ b/fs/ntfs/super.c @@ -443,6 +443,8 @@ static int ntfs_remount(struct super_block *sb, int *flags, char *opt) ntfs_volume *vol = NTFS_SB(sb); ntfs_debug("Entering with remount options string: %s", opt); + + lock_kernel(); #ifndef NTFS_RW /* For read-only compiled driver, enforce read-only flag. */ *flags |= MS_RDONLY; @@ -466,15 +468,18 @@ static int ntfs_remount(struct super_block *sb, int *flags, char *opt) if (NVolErrors(vol)) { ntfs_error(sb, "Volume has errors and is read-only%s", es); + unlock_kernel(); return -EROFS; } if (vol->vol_flags & VOLUME_IS_DIRTY) { ntfs_error(sb, "Volume is dirty and read-only%s", es); + unlock_kernel(); return -EROFS; } if (vol->vol_flags & VOLUME_MODIFIED_BY_CHKDSK) { ntfs_error(sb, "Volume has been modified by chkdsk " "and is read-only%s", es); + unlock_kernel(); return -EROFS; } if (vol->vol_flags & VOLUME_MUST_MOUNT_RO_MASK) { @@ -482,11 +487,13 @@ static int ntfs_remount(struct super_block *sb, int *flags, char *opt) "(0x%x) and is read-only%s", (unsigned)le16_to_cpu(vol->vol_flags), es); + unlock_kernel(); return -EROFS; } if (ntfs_set_volume_flags(vol, VOLUME_IS_DIRTY)) { ntfs_error(sb, "Failed to set dirty bit in volume " "information flags%s", es); + unlock_kernel(); return -EROFS; } #if 0 @@ -506,18 +513,21 @@ static int ntfs_remount(struct super_block *sb, int *flags, char *opt) ntfs_error(sb, "Failed to empty journal $LogFile%s", es); NVolSetErrors(vol); + unlock_kernel(); return -EROFS; } if (!ntfs_mark_quotas_out_of_date(vol)) { ntfs_error(sb, "Failed to mark quotas out of date%s", es); NVolSetErrors(vol); + unlock_kernel(); return -EROFS; } if (!ntfs_stamp_usnjrnl(vol)) { ntfs_error(sb, "Failed to stamp transation log " "($UsnJrnl)%s", es); NVolSetErrors(vol); + unlock_kernel(); return -EROFS; } } else if (!(sb->s_flags & MS_RDONLY) && (*flags & MS_RDONLY)) { @@ -533,8 +543,11 @@ static int ntfs_remount(struct super_block *sb, int *flags, char *opt) // TODO: Deal with *flags. - if (!parse_options(vol, opt)) + if (!parse_options(vol, opt)) { + unlock_kernel(); return -EINVAL; + } + unlock_kernel(); ntfs_debug("Done."); return 0; } diff --git a/fs/ocfs2/super.c b/fs/ocfs2/super.c index 02737596b597..201b40a441fe 100644 --- a/fs/ocfs2/super.c +++ b/fs/ocfs2/super.c @@ -42,6 +42,7 @@ #include #include #include +#include #define MLOG_MASK_PREFIX ML_SUPER #include @@ -581,6 +582,8 @@ static int ocfs2_remount(struct super_block *sb, int *flags, char *data) struct mount_options parsed_options; struct ocfs2_super *osb = OCFS2_SB(sb); + lock_kernel(); + if (!ocfs2_parse_options(sb, data, &parsed_options, 1)) { ret = -EINVAL; goto out; @@ -684,6 +687,7 @@ unlock_osb: ocfs2_set_journal_params(osb); } out: + unlock_kernel(); return ret; } diff --git a/fs/reiserfs/super.c b/fs/reiserfs/super.c index 90dcb7b033ea..2969773cfc22 100644 --- a/fs/reiserfs/super.c +++ b/fs/reiserfs/super.c @@ -28,6 +28,7 @@ #include #include #include +#include struct file_system_type reiserfs_fs_type; @@ -1196,6 +1197,7 @@ static int reiserfs_remount(struct super_block *s, int *mount_flags, char *arg) memcpy(qf_names, REISERFS_SB(s)->s_qf_names, sizeof(qf_names)); #endif + lock_kernel(); rs = SB_DISK_SUPER_BLOCK(s); if (!reiserfs_parse_options @@ -1318,10 +1320,12 @@ static int reiserfs_remount(struct super_block *s, int *mount_flags, char *arg) out_ok: replace_mount_options(s, new_opts); + unlock_kernel(); return 0; out_err: kfree(new_opts); + unlock_kernel(); return err; } diff --git a/fs/super.c b/fs/super.c index 1905f4af01cc..83b47416d006 100644 --- a/fs/super.c +++ b/fs/super.c @@ -540,7 +540,6 @@ int do_remount_sb(struct super_block *sb, int flags, void *data, int force) shrink_dcache_sb(sb); sync_filesystem(sb); - lock_kernel(); /* If we are remounting RDONLY and current sb is read/write, make sure there are no rw files opened */ if ((flags & MS_RDONLY) && !(sb->s_flags & MS_RDONLY)) { @@ -566,7 +565,6 @@ int do_remount_sb(struct super_block *sb, int flags, void *data, int force) } } sb->s_flags = (sb->s_flags & ~MS_RMT_MASK) | (flags & MS_RMT_MASK); - unlock_kernel(); if (remount_rw) vfs_dq_quota_on_remount(sb); return 0; diff --git a/fs/ubifs/super.c b/fs/ubifs/super.c index 522c3fd7eb3c..3589eab02a2f 100644 --- a/fs/ubifs/super.c +++ b/fs/ubifs/super.c @@ -36,6 +36,7 @@ #include #include #include +#include #include "ubifs.h" /* @@ -1770,17 +1771,22 @@ static int ubifs_remount_fs(struct super_block *sb, int *flags, char *data) return err; } + lock_kernel(); if ((sb->s_flags & MS_RDONLY) && !(*flags & MS_RDONLY)) { if (c->ro_media) { ubifs_msg("cannot re-mount due to prior errors"); + unlock_kernel(); return -EROFS; } err = ubifs_remount_rw(c); - if (err) + if (err) { + unlock_kernel(); return err; + } } else if (!(sb->s_flags & MS_RDONLY) && (*flags & MS_RDONLY)) { if (c->ro_media) { ubifs_msg("cannot re-mount due to prior errors"); + unlock_kernel(); return -EROFS; } ubifs_remount_ro(c); @@ -1795,6 +1801,7 @@ static int ubifs_remount_fs(struct super_block *sb, int *flags, char *data) } ubifs_assert(c->lst.taken_empty_lebs > 0); + unlock_kernel(); return 0; } diff --git a/fs/udf/super.c b/fs/udf/super.c index 04802cc39b18..6832135159b6 100644 --- a/fs/udf/super.c +++ b/fs/udf/super.c @@ -568,6 +568,7 @@ static int udf_remount_fs(struct super_block *sb, int *flags, char *options) if (!udf_parse_options(options, &uopt, true)) return -EINVAL; + lock_kernel(); sbi->s_flags = uopt.flags; sbi->s_uid = uopt.uid; sbi->s_gid = uopt.gid; @@ -581,13 +582,16 @@ static int udf_remount_fs(struct super_block *sb, int *flags, char *options) *flags |= MS_RDONLY; } - if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY)) + if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY)) { + unlock_kernel(); return 0; + } if (*flags & MS_RDONLY) udf_close_lvid(sb); else udf_open_lvid(sb); + unlock_kernel(); return 0; } diff --git a/fs/ufs/super.c b/fs/ufs/super.c index c97210ee0670..6560dda7b18c 100644 --- a/fs/ufs/super.c +++ b/fs/ufs/super.c @@ -263,6 +263,7 @@ void ufs_panic (struct super_block * sb, const char * function, struct ufs_super_block_first * usb1; va_list args; + lock_kernel(); uspi = UFS_SB(sb)->s_uspi; usb1 = ubh_get_usb_first(uspi); @@ -1182,7 +1183,8 @@ static int ufs_remount (struct super_block *sb, int *mount_flags, char *data) struct ufs_super_block_third * usb3; unsigned new_mount_opt, ufstype; unsigned flags; - + + lock_kernel(); lock_super(sb); uspi = UFS_SB(sb)->s_uspi; flags = UFS_SB(sb)->s_flags; @@ -1198,6 +1200,7 @@ static int ufs_remount (struct super_block *sb, int *mount_flags, char *data) ufs_set_opt (new_mount_opt, ONERROR_LOCK); if (!ufs_parse_options (data, &new_mount_opt)) { unlock_super(sb); + unlock_kernel(); return -EINVAL; } if (!(new_mount_opt & UFS_MOUNT_UFSTYPE)) { @@ -1205,12 +1208,14 @@ static int ufs_remount (struct super_block *sb, int *mount_flags, char *data) } else if ((new_mount_opt & UFS_MOUNT_UFSTYPE) != ufstype) { printk("ufstype can't be changed during remount\n"); unlock_super(sb); + unlock_kernel(); return -EINVAL; } if ((*mount_flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY)) { UFS_SB(sb)->s_mount_opt = new_mount_opt; unlock_super(sb); + unlock_kernel(); return 0; } @@ -1236,6 +1241,7 @@ static int ufs_remount (struct super_block *sb, int *mount_flags, char *data) printk("ufs was compiled with read-only support, " "can't be mounted as read-write\n"); unlock_super(sb); + unlock_kernel(); return -EINVAL; #else if (ufstype != UFS_MOUNT_UFSTYPE_SUN && @@ -1245,11 +1251,13 @@ static int ufs_remount (struct super_block *sb, int *mount_flags, char *data) ufstype != UFS_MOUNT_UFSTYPE_UFS2) { printk("this ufstype is read-only supported\n"); unlock_super(sb); + unlock_kernel(); return -EINVAL; } if (!ufs_read_cylinder_structures(sb)) { printk("failed during remounting\n"); unlock_super(sb); + unlock_kernel(); return -EPERM; } sb->s_flags &= ~MS_RDONLY; @@ -1257,6 +1265,7 @@ static int ufs_remount (struct super_block *sb, int *mount_flags, char *data) } UFS_SB(sb)->s_mount_opt = new_mount_opt; unlock_super(sb); + unlock_kernel(); return 0; } diff --git a/kernel/cgroup.c b/kernel/cgroup.c index a7267bfd3765..3fb789f6df94 100644 --- a/kernel/cgroup.c +++ b/kernel/cgroup.c @@ -46,6 +46,7 @@ #include #include #include +#include #include @@ -900,6 +901,7 @@ static int cgroup_remount(struct super_block *sb, int *flags, char *data) struct cgroup *cgrp = &root->top_cgroup; struct cgroup_sb_opts opts; + lock_kernel(); mutex_lock(&cgrp->dentry->d_inode->i_mutex); mutex_lock(&cgroup_mutex); @@ -927,6 +929,7 @@ static int cgroup_remount(struct super_block *sb, int *flags, char *data) kfree(opts.release_agent); mutex_unlock(&cgroup_mutex); mutex_unlock(&cgrp->dentry->d_inode->i_mutex); + unlock_kernel(); return ret; } -- cgit v1.2.3 From d731e06323cb705003e4172ec209e469be4c18e1 Mon Sep 17 00:00:00 2001 From: Christoph Hellwig Date: Mon, 8 Jun 2009 10:08:36 +0200 Subject: nilfs2: call nilfs2_write_super from nilfs2_sync_fs The call to ->write_super from __sync_filesystem will go away, so make sure nilfs2 performs the same actions from inside ->sync_fs. Signed-off-by: Christoph Hellwig Signed-off-by: Al Viro --- fs/nilfs2/super.c | 2 ++ 1 file changed, 2 insertions(+) (limited to 'fs/nilfs2/super.c') diff --git a/fs/nilfs2/super.c b/fs/nilfs2/super.c index 11151eaa2c4a..122dc1e489fb 100644 --- a/fs/nilfs2/super.c +++ b/fs/nilfs2/super.c @@ -391,6 +391,8 @@ static int nilfs_sync_fs(struct super_block *sb, int wait) { int err = 0; + nilfs_write_super(sb); + /* This function is called when super block should be written back */ if (wait) err = nilfs_construct_segment(sb); -- cgit v1.2.3 From 81fc20bd0e75ba6357bce2403767d7c2585d8f28 Mon Sep 17 00:00:00 2001 From: Ryusuke Konishi Date: Mon, 8 Jun 2009 01:39:28 +0900 Subject: nilfs2: remove meaningless EBUSY case from nilfs_get_sb function The following EBUSY case in nilfs_get_sb() is meaningless. Indeed, this error code is never returned to the caller. if (!s->s_root) { ... } else if (!(s->s_flags & MS_RDONLY)) { err = -EBUSY; } This simply removes the else case. Signed-off-by: Ryusuke Konishi Signed-off-by: Al Viro --- fs/nilfs2/super.c | 2 -- 1 file changed, 2 deletions(-) (limited to 'fs/nilfs2/super.c') diff --git a/fs/nilfs2/super.c b/fs/nilfs2/super.c index 122dc1e489fb..1c505d0e031e 100644 --- a/fs/nilfs2/super.c +++ b/fs/nilfs2/super.c @@ -1186,8 +1186,6 @@ nilfs_get_sb(struct file_system_type *fs_type, int flags, s->s_flags |= MS_ACTIVE; need_to_close = 0; - } else if (!(s->s_flags & MS_RDONLY)) { - err = -EBUSY; } up(&sd.bdev->bd_mount_sem); -- cgit v1.2.3 From 33c8e57c86d1bd1548c12a4f7c4bceb94b862cca Mon Sep 17 00:00:00 2001 From: Ryusuke Konishi Date: Mon, 8 Jun 2009 01:39:29 +0900 Subject: nilfs2: get rid of sget use for acquiring nilfs object This will change the way to obtain nilfs object in nilfs_get_sb() function. Previously, a preliminary sget() call was performed, and the nilfs object was acquired from a super block instance found by the sget() call. This patch, instead, instroduces a new dedicated function find_or_create_nilfs(); as the name implies, the function finds an existent nilfs object from a global list or creates a new one if no object is found on the device. Signed-off-by: Ryusuke Konishi Cc: Al Viro Signed-off-by: Al Viro --- fs/nilfs2/super.c | 80 ++++++++++++--------------------------------------- fs/nilfs2/the_nilfs.c | 57 ++++++++++++++++++++++++++++++++++-- fs/nilfs2/the_nilfs.h | 4 ++- 3 files changed, 76 insertions(+), 65 deletions(-) (limited to 'fs/nilfs2/super.c') diff --git a/fs/nilfs2/super.c b/fs/nilfs2/super.c index 1c505d0e031e..3c9833e3e74a 100644 --- a/fs/nilfs2/super.c +++ b/fs/nilfs2/super.c @@ -1059,13 +1059,6 @@ static int nilfs_set_bdev_super(struct super_block *s, void *data) } static int nilfs_test_bdev_super(struct super_block *s, void *data) -{ - struct nilfs_super_data *sd = data; - - return s->s_bdev == sd->bdev; -} - -static int nilfs_test_bdev_super2(struct super_block *s, void *data) { struct nilfs_super_data *sd = data; int ret; @@ -1096,8 +1089,8 @@ nilfs_get_sb(struct file_system_type *fs_type, int flags, const char *dev_name, void *data, struct vfsmount *mnt) { struct nilfs_super_data sd; - struct super_block *s, *s2; - struct the_nilfs *nilfs = NULL; + struct super_block *s; + struct the_nilfs *nilfs; int err, need_to_close = 1; sd.bdev = open_bdev_exclusive(dev_name, flags, fs_type); @@ -1118,11 +1111,12 @@ nilfs_get_sb(struct file_system_type *fs_type, int flags, goto failed; } - /* - * once the super is inserted into the list by sget, s_umount - * will protect the lockfs code from trying to start a snapshot - * while we are mounting - */ + nilfs = find_or_create_nilfs(sd.bdev); + if (!nilfs) { + err = -ENOMEM; + goto failed; + } + down(&sd.bdev->bd_mount_sem); if (!sd.cno && (err = test_exclusive_mount(fs_type, sd.bdev, flags ^ MS_RDONLY))) { @@ -1131,51 +1125,22 @@ nilfs_get_sb(struct file_system_type *fs_type, int flags, } /* - * Phase-1: search any existent instance and get the_nilfs + * Search specified snapshot or R/W mode super_block */ - s = sget(fs_type, nilfs_test_bdev_super, nilfs_set_bdev_super, &sd); - if (IS_ERR(s)) - goto error_s; - - if (!s->s_root) { - err = -ENOMEM; - nilfs = alloc_nilfs(sd.bdev); - if (!nilfs) - goto cancel_new; - } else { - struct nilfs_sb_info *sbi = NILFS_SB(s); + if (!sd.cno) + /* trying to get the latest checkpoint. */ + sd.cno = nilfs_last_cno(nilfs); - /* - * s_umount protects super_block from unmount process; - * It covers pointers of nilfs_sb_info and the_nilfs. - */ - nilfs = sbi->s_nilfs; - get_nilfs(nilfs); - up_write(&s->s_umount); - - /* - * Phase-2: search specified snapshot or R/W mode super_block - */ - if (!sd.cno) - /* trying to get the latest checkpoint. */ - sd.cno = nilfs_last_cno(nilfs); - - s2 = sget(fs_type, nilfs_test_bdev_super2, - nilfs_set_bdev_super, &sd); - deactivate_super(s); - /* - * Although deactivate_super() invokes close_bdev_exclusive() at - * kill_block_super(). Here, s is an existent mount; we need - * one more close_bdev_exclusive() call. - */ - s = s2; - if (IS_ERR(s)) - goto error_s; + s = sget(fs_type, nilfs_test_bdev_super, nilfs_set_bdev_super, &sd); + if (IS_ERR(s)) { + err = PTR_ERR(s); + goto failed_unlock; } if (!s->s_root) { char b[BDEVNAME_SIZE]; + /* New superblock instance created */ s->s_flags = flags; strlcpy(s->s_id, bdevname(sd.bdev, b), sizeof(s->s_id)); sb_set_blocksize(s, block_size(sd.bdev)); @@ -1195,15 +1160,9 @@ nilfs_get_sb(struct file_system_type *fs_type, int flags, simple_set_mnt(mnt, s); return 0; - error_s: - up(&sd.bdev->bd_mount_sem); - if (nilfs) - put_nilfs(nilfs); - close_bdev_exclusive(sd.bdev, flags); - return PTR_ERR(s); - failed_unlock: up(&sd.bdev->bd_mount_sem); + put_nilfs(nilfs); failed: close_bdev_exclusive(sd.bdev, flags); @@ -1212,8 +1171,7 @@ nilfs_get_sb(struct file_system_type *fs_type, int flags, cancel_new: /* Abandoning the newly allocated superblock */ up(&sd.bdev->bd_mount_sem); - if (nilfs) - put_nilfs(nilfs); + put_nilfs(nilfs); up_write(&s->s_umount); deactivate_super(s); /* diff --git a/fs/nilfs2/the_nilfs.c b/fs/nilfs2/the_nilfs.c index a91f15b8673c..45dbf6a61744 100644 --- a/fs/nilfs2/the_nilfs.c +++ b/fs/nilfs2/the_nilfs.c @@ -35,6 +35,10 @@ #include "seglist.h" #include "segbuf.h" + +static LIST_HEAD(nilfs_objects); +static DEFINE_SPINLOCK(nilfs_lock); + void nilfs_set_last_segment(struct the_nilfs *nilfs, sector_t start_blocknr, u64 seq, __u64 cno) { @@ -55,7 +59,7 @@ void nilfs_set_last_segment(struct the_nilfs *nilfs, * Return Value: On success, pointer to the_nilfs is returned. * On error, NULL is returned. */ -struct the_nilfs *alloc_nilfs(struct block_device *bdev) +static struct the_nilfs *alloc_nilfs(struct block_device *bdev) { struct the_nilfs *nilfs; @@ -69,6 +73,7 @@ struct the_nilfs *alloc_nilfs(struct block_device *bdev) atomic_set(&nilfs->ns_ndirtyblks, 0); init_rwsem(&nilfs->ns_sem); mutex_init(&nilfs->ns_writer_mutex); + INIT_LIST_HEAD(&nilfs->ns_list); INIT_LIST_HEAD(&nilfs->ns_supers); spin_lock_init(&nilfs->ns_last_segment_lock); nilfs->ns_gc_inodes_h = NULL; @@ -77,6 +82,45 @@ struct the_nilfs *alloc_nilfs(struct block_device *bdev) return nilfs; } +/** + * find_or_create_nilfs - find or create nilfs object + * @bdev: block device to which the_nilfs is related + * + * find_nilfs() looks up an existent nilfs object created on the + * device and gets the reference count of the object. If no nilfs object + * is found on the device, a new nilfs object is allocated. + * + * Return Value: On success, pointer to the nilfs object is returned. + * On error, NULL is returned. + */ +struct the_nilfs *find_or_create_nilfs(struct block_device *bdev) +{ + struct the_nilfs *nilfs, *new = NULL; + + retry: + spin_lock(&nilfs_lock); + list_for_each_entry(nilfs, &nilfs_objects, ns_list) { + if (nilfs->ns_bdev == bdev) { + get_nilfs(nilfs); + spin_unlock(&nilfs_lock); + if (new) + put_nilfs(new); + return nilfs; /* existing object */ + } + } + if (new) { + list_add_tail(&new->ns_list, &nilfs_objects); + spin_unlock(&nilfs_lock); + return new; /* new object */ + } + spin_unlock(&nilfs_lock); + + new = alloc_nilfs(bdev); + if (new) + goto retry; + return NULL; /* insufficient memory */ +} + /** * put_nilfs - release a reference to the_nilfs * @nilfs: the_nilfs structure to be released @@ -86,13 +130,20 @@ struct the_nilfs *alloc_nilfs(struct block_device *bdev) */ void put_nilfs(struct the_nilfs *nilfs) { - if (!atomic_dec_and_test(&nilfs->ns_count)) + spin_lock(&nilfs_lock); + if (!atomic_dec_and_test(&nilfs->ns_count)) { + spin_unlock(&nilfs_lock); return; + } + list_del_init(&nilfs->ns_list); + spin_unlock(&nilfs_lock); + /* - * Increment of ns_count never occur below because the caller + * Increment of ns_count never occurs below because the caller * of get_nilfs() holds at least one reference to the_nilfs. * Thus its exclusion control is not required here. */ + might_sleep(); if (nilfs_loaded(nilfs)) { nilfs_mdt_clear(nilfs->ns_sufile); diff --git a/fs/nilfs2/the_nilfs.h b/fs/nilfs2/the_nilfs.h index 30fe58778d05..116caf96e7f3 100644 --- a/fs/nilfs2/the_nilfs.h +++ b/fs/nilfs2/the_nilfs.h @@ -43,6 +43,7 @@ enum { * struct the_nilfs - struct to supervise multiple nilfs mount points * @ns_flags: flags * @ns_count: reference count + * @ns_list: list head for nilfs_list * @ns_bdev: block device * @ns_bdi: backing dev info * @ns_writer: back pointer to writable nilfs_sb_info @@ -88,6 +89,7 @@ enum { struct the_nilfs { unsigned long ns_flags; atomic_t ns_count; + struct list_head ns_list; struct block_device *ns_bdev; struct backing_dev_info *ns_bdi; @@ -191,7 +193,7 @@ THE_NILFS_FNS(DISCONTINUED, discontinued) #define NILFS_ALTSB_FREQ 60 /* spare superblock */ void nilfs_set_last_segment(struct the_nilfs *, sector_t, u64, __u64); -struct the_nilfs *alloc_nilfs(struct block_device *); +struct the_nilfs *find_or_create_nilfs(struct block_device *); void put_nilfs(struct the_nilfs *); int init_nilfs(struct the_nilfs *, struct nilfs_sb_info *, char *); int load_nilfs(struct the_nilfs *, struct nilfs_sb_info *); -- cgit v1.2.3 From 3f82ff55168e92859119bf348e9e0bd6714d2fea Mon Sep 17 00:00:00 2001 From: Ryusuke Konishi Date: Mon, 8 Jun 2009 01:39:30 +0900 Subject: nilfs2: get rid of sget use for checking if current mount is present This stops using sget() for checking if an r/w-mount or an r/o-mount exists on the device. This elimination uses a back pointer to the current mount added to nilfs object. Signed-off-by: Ryusuke Konishi Cc: Al Viro Signed-off-by: Al Viro --- fs/nilfs2/super.c | 92 ++++++++++++++++++--------------------------------- fs/nilfs2/the_nilfs.h | 3 ++ 2 files changed, 35 insertions(+), 60 deletions(-) (limited to 'fs/nilfs2/super.c') diff --git a/fs/nilfs2/super.c b/fs/nilfs2/super.c index 3c9833e3e74a..5a8c5e4731b3 100644 --- a/fs/nilfs2/super.c +++ b/fs/nilfs2/super.c @@ -67,8 +67,6 @@ MODULE_LICENSE("GPL"); static void nilfs_write_super(struct super_block *sb); static int nilfs_remount(struct super_block *sb, int *flags, char *data); -static int test_exclusive_mount(struct file_system_type *fs_type, - struct block_device *bdev, int flags); /** * nilfs_error() - report failure condition on a filesystem @@ -329,6 +327,10 @@ static void nilfs_put_super(struct super_block *sb) nilfs_commit_super(sbi, 1); up_write(&nilfs->ns_sem); } + down_write(&nilfs->ns_sem); + if (nilfs->ns_current == sbi) + nilfs->ns_current = NULL; + up_write(&nilfs->ns_sem); nilfs_detach_checkpoint(sbi); put_nilfs(sbi->s_nilfs); @@ -880,6 +882,11 @@ nilfs_fill_super(struct super_block *sb, void *data, int silent, goto failed_root; } + down_write(&nilfs->ns_sem); + if (!nilfs_test_opt(sbi, SNAPSHOT)) + nilfs->ns_current = sbi; + up_write(&nilfs->ns_sem); + return 0; failed_root: @@ -958,14 +965,16 @@ static int nilfs_remount(struct super_block *sb, int *flags, char *data) * by fsck since we originally mounted the partition.) */ down(&sb->s_bdev->bd_mount_sem); - /* Check existing RW-mount */ - if (test_exclusive_mount(sb->s_type, sb->s_bdev, 0)) { + down_read(&nilfs->ns_sem); + if (nilfs->ns_current && nilfs->ns_current != sbi) { printk(KERN_WARNING "NILFS (device %s): couldn't " - "remount because a RW-mount exists.\n", + "remount because an RW-mount exists.\n", sb->s_id); + up_read(&nilfs->ns_sem); err = -EBUSY; goto rw_remount_failed; } + up_read(&nilfs->ns_sem); if (sbi->s_snapshot_cno != nilfs_last_cno(nilfs)) { printk(KERN_WARNING "NILFS (device %s): couldn't " "remount because the current RO-mount is not " @@ -984,6 +993,7 @@ static int nilfs_remount(struct super_block *sb, int *flags, char *data) down_write(&nilfs->ns_sem); nilfs_setup_super(sbi); + nilfs->ns_current = sbi; up_write(&nilfs->ns_sem); up(&sb->s_bdev->bd_mount_sem); @@ -1118,10 +1128,23 @@ nilfs_get_sb(struct file_system_type *fs_type, int flags, } down(&sd.bdev->bd_mount_sem); - if (!sd.cno && - (err = test_exclusive_mount(fs_type, sd.bdev, flags ^ MS_RDONLY))) { - err = (err < 0) ? : -EBUSY; - goto failed_unlock; + + if (!sd.cno) { + /* + * Check if an exclusive mount exists or not. + * Snapshot mounts coexist with a current mount + * (i.e. rw-mount or ro-mount), whereas rw-mount and + * ro-mount are mutually exclusive. + */ + down_read(&nilfs->ns_sem); + if (nilfs->ns_current && + ((nilfs->ns_current->s_super->s_flags ^ flags) + & MS_RDONLY)) { + up_read(&nilfs->ns_sem); + err = -EBUSY; + goto failed_unlock; + } + up_read(&nilfs->ns_sem); } /* @@ -1182,57 +1205,6 @@ nilfs_get_sb(struct file_system_type *fs_type, int flags, return err; } -static int nilfs_test_bdev_super3(struct super_block *s, void *data) -{ - struct nilfs_super_data *sd = data; - int ret; - - if (s->s_bdev != sd->bdev) - return 0; - if (down_read_trylock(&s->s_umount)) { - ret = (s->s_flags & MS_RDONLY) && s->s_root && - nilfs_test_opt(NILFS_SB(s), SNAPSHOT); - up_read(&s->s_umount); - if (ret) - return 0; /* ignore snapshot mounts */ - } - return !((sd->flags ^ s->s_flags) & MS_RDONLY); -} - -static int __false_bdev_super(struct super_block *s, void *data) -{ -#if 0 /* XXX: workaround for lock debug. This is not good idea */ - up_write(&s->s_umount); -#endif - return -EFAULT; -} - -/** - * test_exclusive_mount - check whether an exclusive RW/RO mount exists or not. - * fs_type: filesystem type - * bdev: block device - * flag: 0 (check rw-mount) or MS_RDONLY (check ro-mount) - * res: pointer to an integer to store result - * - * This function must be called within a section protected by bd_mount_mutex. - */ -static int test_exclusive_mount(struct file_system_type *fs_type, - struct block_device *bdev, int flags) -{ - struct super_block *s; - struct nilfs_super_data sd = { .flags = flags, .bdev = bdev }; - - s = sget(fs_type, nilfs_test_bdev_super3, __false_bdev_super, &sd); - if (IS_ERR(s)) { - if (PTR_ERR(s) != -EFAULT) - return PTR_ERR(s); - return 0; /* Not found */ - } - up_write(&s->s_umount); - deactivate_super(s); - return 1; /* Found */ -} - struct file_system_type nilfs_fs_type = { .owner = THIS_MODULE, .name = "nilfs2", diff --git a/fs/nilfs2/the_nilfs.h b/fs/nilfs2/the_nilfs.h index 116caf96e7f3..99f7e29a5335 100644 --- a/fs/nilfs2/the_nilfs.h +++ b/fs/nilfs2/the_nilfs.h @@ -50,6 +50,7 @@ enum { * @ns_sem: semaphore for shared states * @ns_writer_mutex: mutex protecting ns_writer attach/detach * @ns_writer_refcount: number of referrers on ns_writer + * @ns_current: back pointer to current mount * @ns_sbh: buffer heads of on-disk super blocks * @ns_sbp: pointers to super block data * @ns_sbwtime: previous write time of super blocks @@ -98,6 +99,8 @@ struct the_nilfs { struct mutex ns_writer_mutex; atomic_t ns_writer_refcount; + struct nilfs_sb_info *ns_current; + /* * used for * - loading the latest checkpoint exclusively. -- cgit v1.2.3 From 6dd4740662405a68bb229ac2b9e0aeaaf2188bf2 Mon Sep 17 00:00:00 2001 From: Ryusuke Konishi Date: Mon, 8 Jun 2009 01:39:31 +0900 Subject: nilfs2: simplify remaining sget() use This simplifies the test function passed on the remaining sget() callsite in nilfs. Instead of checking mount type (i.e. ro-mount/rw-mount/snapshot mount) in the test function passed to sget(), this patch first looks up the nilfs_sb_info struct which the given mount type matches, and then acquires the super block instance holding the nilfs_sb_info. Signed-off-by: Ryusuke Konishi Cc: Al Viro Signed-off-by: Al Viro --- fs/nilfs2/sb.h | 1 + fs/nilfs2/super.c | 42 +++++++++++++++++------------------------- fs/nilfs2/the_nilfs.c | 50 ++++++++++++++++++++++++++++++++++++++++++++++++++ fs/nilfs2/the_nilfs.h | 7 +++++++ 4 files changed, 75 insertions(+), 25 deletions(-) (limited to 'fs/nilfs2/super.c') diff --git a/fs/nilfs2/sb.h b/fs/nilfs2/sb.h index adccd4fc654e..0776ccc2504a 100644 --- a/fs/nilfs2/sb.h +++ b/fs/nilfs2/sb.h @@ -60,6 +60,7 @@ struct nilfs_sb_info { struct super_block *s_super; /* reverse pointer to super_block */ struct the_nilfs *s_nilfs; struct list_head s_list; /* list head for nilfs->ns_supers */ + atomic_t s_count; /* reference count */ /* Segment constructor */ struct list_head s_dirty_files; /* dirty files list */ diff --git a/fs/nilfs2/super.c b/fs/nilfs2/super.c index 5a8c5e4731b3..1d1b6e125159 100644 --- a/fs/nilfs2/super.c +++ b/fs/nilfs2/super.c @@ -336,7 +336,7 @@ static void nilfs_put_super(struct super_block *sb) put_nilfs(sbi->s_nilfs); sbi->s_super = NULL; sb->s_fs_info = NULL; - kfree(sbi); + nilfs_put_sbinfo(sbi); unlock_kernel(); } @@ -785,6 +785,7 @@ nilfs_fill_super(struct super_block *sb, void *data, int silent, get_nilfs(nilfs); sbi->s_nilfs = nilfs; sbi->s_super = sb; + atomic_set(&sbi->s_count, 1); err = init_nilfs(nilfs, sbi, (char *)data); if (err) @@ -902,7 +903,7 @@ nilfs_fill_super(struct super_block *sb, void *data, int silent, failed_sbi: put_nilfs(nilfs); sb->s_fs_info = NULL; - kfree(sbi); + nilfs_put_sbinfo(sbi); return err; } @@ -1014,6 +1015,7 @@ static int nilfs_remount(struct super_block *sb, int *flags, char *data) struct nilfs_super_data { struct block_device *bdev; + struct nilfs_sb_info *sbi; __u64 cno; int flags; }; @@ -1071,27 +1073,8 @@ static int nilfs_set_bdev_super(struct super_block *s, void *data) static int nilfs_test_bdev_super(struct super_block *s, void *data) { struct nilfs_super_data *sd = data; - int ret; - - if (s->s_bdev != sd->bdev) - return 0; - - if (!((s->s_flags | sd->flags) & MS_RDONLY)) - return 1; /* Reuse an old R/W-mode super_block */ - - if (s->s_flags & sd->flags & MS_RDONLY) { - if (down_read_trylock(&s->s_umount)) { - ret = s->s_root && - (sd->cno == NILFS_SB(s)->s_snapshot_cno); - up_read(&s->s_umount); - /* - * This path is locked with sb_lock by sget(). - * So, drop_super() causes deadlock. - */ - return ret; - } - } - return 0; + + return sd->sbi && s->s_fs_info == (void *)sd->sbi; } static int @@ -1112,7 +1095,6 @@ nilfs_get_sb(struct file_system_type *fs_type, int flags, * much more information than normal filesystems to identify mount * instance. For snapshot mounts, not only a mount type (ro-mount * or rw-mount) but also a checkpoint number is required. - * The results are passed in sget() using nilfs_super_data. */ sd.cno = 0; sd.flags = flags; @@ -1148,13 +1130,23 @@ nilfs_get_sb(struct file_system_type *fs_type, int flags, } /* - * Search specified snapshot or R/W mode super_block + * Find existing nilfs_sb_info struct */ + sd.sbi = nilfs_find_sbinfo(nilfs, !(flags & MS_RDONLY), sd.cno); + if (!sd.cno) /* trying to get the latest checkpoint. */ sd.cno = nilfs_last_cno(nilfs); + /* + * Get super block instance holding the nilfs_sb_info struct. + * A new instance is allocated if no existing mount is present or + * existing instance has been unmounted. + */ s = sget(fs_type, nilfs_test_bdev_super, nilfs_set_bdev_super, &sd); + if (sd.sbi) + nilfs_put_sbinfo(sd.sbi); + if (IS_ERR(s)) { err = PTR_ERR(s); goto failed_unlock; diff --git a/fs/nilfs2/the_nilfs.c b/fs/nilfs2/the_nilfs.c index 45dbf6a61744..221953bfc859 100644 --- a/fs/nilfs2/the_nilfs.c +++ b/fs/nilfs2/the_nilfs.c @@ -664,6 +664,56 @@ int nilfs_near_disk_full(struct the_nilfs *nilfs) return ret; } +/** + * nilfs_find_sbinfo - find existing nilfs_sb_info structure + * @nilfs: nilfs object + * @rw_mount: mount type (non-zero value for read/write mount) + * @cno: checkpoint number (zero for read-only mount) + * + * nilfs_find_sbinfo() returns the nilfs_sb_info structure which + * @rw_mount and @cno (in case of snapshots) matched. If no instance + * was found, NULL is returned. Although the super block instance can + * be unmounted after this function returns, the nilfs_sb_info struct + * is kept on memory until nilfs_put_sbinfo() is called. + */ +struct nilfs_sb_info *nilfs_find_sbinfo(struct the_nilfs *nilfs, + int rw_mount, __u64 cno) +{ + struct nilfs_sb_info *sbi; + + down_read(&nilfs->ns_sem); + /* + * The SNAPSHOT flag and sb->s_flags are supposed to be + * protected with nilfs->ns_sem. + */ + sbi = nilfs->ns_current; + if (rw_mount) { + if (sbi && !(sbi->s_super->s_flags & MS_RDONLY)) + goto found; /* read/write mount */ + else + goto out; + } else if (cno == 0) { + if (sbi && (sbi->s_super->s_flags & MS_RDONLY)) + goto found; /* read-only mount */ + else + goto out; + } + + list_for_each_entry(sbi, &nilfs->ns_supers, s_list) { + if (nilfs_test_opt(sbi, SNAPSHOT) && + sbi->s_snapshot_cno == cno) + goto found; /* snapshot mount */ + } + out: + up_read(&nilfs->ns_sem); + return NULL; + + found: + atomic_inc(&sbi->s_count); + up_read(&nilfs->ns_sem); + return sbi; +} + int nilfs_checkpoint_is_mounted(struct the_nilfs *nilfs, __u64 cno, int snapshot_mount) { diff --git a/fs/nilfs2/the_nilfs.h b/fs/nilfs2/the_nilfs.h index 99f7e29a5335..be4c040fd629 100644 --- a/fs/nilfs2/the_nilfs.h +++ b/fs/nilfs2/the_nilfs.h @@ -201,6 +201,7 @@ void put_nilfs(struct the_nilfs *); int init_nilfs(struct the_nilfs *, struct nilfs_sb_info *, char *); int load_nilfs(struct the_nilfs *, struct nilfs_sb_info *); int nilfs_count_free_blocks(struct the_nilfs *, sector_t *); +struct nilfs_sb_info *nilfs_find_sbinfo(struct the_nilfs *, int, __u64); int nilfs_checkpoint_is_mounted(struct the_nilfs *, __u64, int); int nilfs_near_disk_full(struct the_nilfs *); void nilfs_fall_back_super_block(struct the_nilfs *); @@ -243,6 +244,12 @@ nilfs_detach_writer(struct the_nilfs *nilfs, struct nilfs_sb_info *sbi) mutex_unlock(&nilfs->ns_writer_mutex); } +static inline void nilfs_put_sbinfo(struct nilfs_sb_info *sbi) +{ + if (!atomic_dec_and_test(&sbi->s_count)) + kfree(sbi); +} + static inline void nilfs_get_segment_range(struct the_nilfs *nilfs, __u64 segnum, sector_t *seg_start, sector_t *seg_end) -- cgit v1.2.3 From e59399d0102c1813cec48db5cebe1750313f88a0 Mon Sep 17 00:00:00 2001 From: Ryusuke Konishi Date: Mon, 8 Jun 2009 01:39:32 +0900 Subject: nilfs2: correct exclusion control in nilfs_remount function nilfs_remount() changes mount state of a superblock instance. Even though nilfs accesses other superblock instances during mount or remount, the mount state was not properly protected in nilfs_remount(). Moreover, nilfs_remount() has a lock order reversal problem; nilfs_get_sb() holds: 1. bdev->bd_mount_sem 2. sb->s_umount (sget acquires) and nilfs_remount() holds: 1. sb->s_umount (locked by the caller in vfs) 2. bdev->bd_mount_sem To avoid these problems, this patch divides a semaphore protecting super block instances from nilfs->ns_sem, and applies it to the mount state protection in nilfs_remount(). With this change, bd_mount_sem use is removed from nilfs_remount() and the lock order reversal will be resolved. And the new rw-semaphore, nilfs->ns_super_sem will properly protect the mount state except the modification from nilfs_error function. Signed-off-by: Ryusuke Konishi Signed-off-by: Al Viro --- fs/nilfs2/super.c | 44 ++++++++++++++++++++------------------------ fs/nilfs2/the_nilfs.c | 13 +++++++------ fs/nilfs2/the_nilfs.h | 7 ++++++- 3 files changed, 33 insertions(+), 31 deletions(-) (limited to 'fs/nilfs2/super.c') diff --git a/fs/nilfs2/super.c b/fs/nilfs2/super.c index 1d1b6e125159..f02762fa8ea0 100644 --- a/fs/nilfs2/super.c +++ b/fs/nilfs2/super.c @@ -327,10 +327,10 @@ static void nilfs_put_super(struct super_block *sb) nilfs_commit_super(sbi, 1); up_write(&nilfs->ns_sem); } - down_write(&nilfs->ns_sem); + down_write(&nilfs->ns_super_sem); if (nilfs->ns_current == sbi) nilfs->ns_current = NULL; - up_write(&nilfs->ns_sem); + up_write(&nilfs->ns_super_sem); nilfs_detach_checkpoint(sbi); put_nilfs(sbi->s_nilfs); @@ -408,9 +408,9 @@ int nilfs_attach_checkpoint(struct nilfs_sb_info *sbi, __u64 cno) struct buffer_head *bh_cp; int err; - down_write(&nilfs->ns_sem); + down_write(&nilfs->ns_super_sem); list_add(&sbi->s_list, &nilfs->ns_supers); - up_write(&nilfs->ns_sem); + up_write(&nilfs->ns_super_sem); sbi->s_ifile = nilfs_mdt_new( nilfs, sbi->s_super, NILFS_IFILE_INO, NILFS_IFILE_GFP); @@ -448,9 +448,9 @@ int nilfs_attach_checkpoint(struct nilfs_sb_info *sbi, __u64 cno) nilfs_mdt_destroy(sbi->s_ifile); sbi->s_ifile = NULL; - down_write(&nilfs->ns_sem); + down_write(&nilfs->ns_super_sem); list_del_init(&sbi->s_list); - up_write(&nilfs->ns_sem); + up_write(&nilfs->ns_super_sem); return err; } @@ -462,9 +462,9 @@ void nilfs_detach_checkpoint(struct nilfs_sb_info *sbi) nilfs_mdt_clear(sbi->s_ifile); nilfs_mdt_destroy(sbi->s_ifile); sbi->s_ifile = NULL; - down_write(&nilfs->ns_sem); + down_write(&nilfs->ns_super_sem); list_del_init(&sbi->s_list); - up_write(&nilfs->ns_sem); + up_write(&nilfs->ns_super_sem); } static int nilfs_mark_recovery_complete(struct nilfs_sb_info *sbi) @@ -883,10 +883,10 @@ nilfs_fill_super(struct super_block *sb, void *data, int silent, goto failed_root; } - down_write(&nilfs->ns_sem); + down_write(&nilfs->ns_super_sem); if (!nilfs_test_opt(sbi, SNAPSHOT)) nilfs->ns_current = sbi; - up_write(&nilfs->ns_sem); + up_write(&nilfs->ns_super_sem); return 0; @@ -918,6 +918,7 @@ static int nilfs_remount(struct super_block *sb, int *flags, char *data) lock_kernel(); + down_write(&nilfs->ns_super_sem); old_sb_flags = sb->s_flags; old_opts.mount_opt = sbi->s_mount_opt; old_opts.snapshot_cno = sbi->s_snapshot_cno; @@ -965,24 +966,20 @@ static int nilfs_remount(struct super_block *sb, int *flags, char *data) * store the current valid flag. (It may have been changed * by fsck since we originally mounted the partition.) */ - down(&sb->s_bdev->bd_mount_sem); - down_read(&nilfs->ns_sem); if (nilfs->ns_current && nilfs->ns_current != sbi) { printk(KERN_WARNING "NILFS (device %s): couldn't " "remount because an RW-mount exists.\n", sb->s_id); - up_read(&nilfs->ns_sem); err = -EBUSY; - goto rw_remount_failed; + goto restore_opts; } - up_read(&nilfs->ns_sem); if (sbi->s_snapshot_cno != nilfs_last_cno(nilfs)) { printk(KERN_WARNING "NILFS (device %s): couldn't " "remount because the current RO-mount is not " "the latest one.\n", sb->s_id); err = -EINVAL; - goto rw_remount_failed; + goto restore_opts; } sb->s_flags &= ~MS_RDONLY; nilfs_clear_opt(sbi, SNAPSHOT); @@ -990,25 +987,24 @@ static int nilfs_remount(struct super_block *sb, int *flags, char *data) err = nilfs_attach_segment_constructor(sbi); if (err) - goto rw_remount_failed; + goto restore_opts; down_write(&nilfs->ns_sem); nilfs_setup_super(sbi); - nilfs->ns_current = sbi; up_write(&nilfs->ns_sem); - up(&sb->s_bdev->bd_mount_sem); + nilfs->ns_current = sbi; } out: + up_write(&nilfs->ns_super_sem); unlock_kernel(); return 0; - rw_remount_failed: - up(&sb->s_bdev->bd_mount_sem); restore_opts: sb->s_flags = old_sb_flags; sbi->s_mount_opt = old_opts.mount_opt; sbi->s_snapshot_cno = old_opts.snapshot_cno; + up_write(&nilfs->ns_super_sem); unlock_kernel(); return err; } @@ -1118,15 +1114,15 @@ nilfs_get_sb(struct file_system_type *fs_type, int flags, * (i.e. rw-mount or ro-mount), whereas rw-mount and * ro-mount are mutually exclusive. */ - down_read(&nilfs->ns_sem); + down_read(&nilfs->ns_super_sem); if (nilfs->ns_current && ((nilfs->ns_current->s_super->s_flags ^ flags) & MS_RDONLY)) { - up_read(&nilfs->ns_sem); + up_read(&nilfs->ns_super_sem); err = -EBUSY; goto failed_unlock; } - up_read(&nilfs->ns_sem); + up_read(&nilfs->ns_super_sem); } /* diff --git a/fs/nilfs2/the_nilfs.c b/fs/nilfs2/the_nilfs.c index 221953bfc859..06e8dfd538d6 100644 --- a/fs/nilfs2/the_nilfs.c +++ b/fs/nilfs2/the_nilfs.c @@ -72,6 +72,7 @@ static struct the_nilfs *alloc_nilfs(struct block_device *bdev) atomic_set(&nilfs->ns_writer_refcount, -1); atomic_set(&nilfs->ns_ndirtyblks, 0); init_rwsem(&nilfs->ns_sem); + init_rwsem(&nilfs->ns_super_sem); mutex_init(&nilfs->ns_writer_mutex); INIT_LIST_HEAD(&nilfs->ns_list); INIT_LIST_HEAD(&nilfs->ns_supers); @@ -681,10 +682,10 @@ struct nilfs_sb_info *nilfs_find_sbinfo(struct the_nilfs *nilfs, { struct nilfs_sb_info *sbi; - down_read(&nilfs->ns_sem); + down_read(&nilfs->ns_super_sem); /* * The SNAPSHOT flag and sb->s_flags are supposed to be - * protected with nilfs->ns_sem. + * protected with nilfs->ns_super_sem. */ sbi = nilfs->ns_current; if (rw_mount) { @@ -705,12 +706,12 @@ struct nilfs_sb_info *nilfs_find_sbinfo(struct the_nilfs *nilfs, goto found; /* snapshot mount */ } out: - up_read(&nilfs->ns_sem); + up_read(&nilfs->ns_super_sem); return NULL; found: atomic_inc(&sbi->s_count); - up_read(&nilfs->ns_sem); + up_read(&nilfs->ns_super_sem); return sbi; } @@ -720,7 +721,7 @@ int nilfs_checkpoint_is_mounted(struct the_nilfs *nilfs, __u64 cno, struct nilfs_sb_info *sbi; int ret = 0; - down_read(&nilfs->ns_sem); + down_read(&nilfs->ns_super_sem); if (cno == 0 || cno > nilfs->ns_cno) goto out_unlock; @@ -737,6 +738,6 @@ int nilfs_checkpoint_is_mounted(struct the_nilfs *nilfs, __u64 cno, ret++; out_unlock: - up_read(&nilfs->ns_sem); + up_read(&nilfs->ns_super_sem); return ret; } diff --git a/fs/nilfs2/the_nilfs.h b/fs/nilfs2/the_nilfs.h index be4c040fd629..d0cf4fb7c9ce 100644 --- a/fs/nilfs2/the_nilfs.h +++ b/fs/nilfs2/the_nilfs.h @@ -48,6 +48,7 @@ enum { * @ns_bdi: backing dev info * @ns_writer: back pointer to writable nilfs_sb_info * @ns_sem: semaphore for shared states + * @ns_super_sem: semaphore for global operations across super block instances * @ns_writer_mutex: mutex protecting ns_writer attach/detach * @ns_writer_refcount: number of referrers on ns_writer * @ns_current: back pointer to current mount @@ -96,10 +97,15 @@ struct the_nilfs { struct backing_dev_info *ns_bdi; struct nilfs_sb_info *ns_writer; struct rw_semaphore ns_sem; + struct rw_semaphore ns_super_sem; struct mutex ns_writer_mutex; atomic_t ns_writer_refcount; + /* + * components protected by ns_super_sem + */ struct nilfs_sb_info *ns_current; + struct list_head ns_supers; /* * used for @@ -113,7 +119,6 @@ struct the_nilfs { time_t ns_sbwtime[2]; unsigned ns_sbsize; unsigned ns_mount_state; - struct list_head ns_supers; /* * Following fields are dedicated to a writable FS-instance. -- cgit v1.2.3 From aa7dfb8954ccf49e026ba13d12991a4eb7defb96 Mon Sep 17 00:00:00 2001 From: Ryusuke Konishi Date: Mon, 8 Jun 2009 01:39:33 +0900 Subject: nilfs2: get rid of bd_mount_sem use from nilfs This will remove every bd_mount_sem use in nilfs. The intended exclusion control was replaced by the previous patch ("nilfs2: correct exclusion control in nilfs_remount function") for nilfs_remount(), and this patch will replace remains with a new mutex that this inserts in nilfs object. Signed-off-by: Ryusuke Konishi Cc: Christoph Hellwig Signed-off-by: Al Viro --- fs/nilfs2/cpfile.c | 6 +++--- fs/nilfs2/super.c | 12 ++++++------ fs/nilfs2/the_nilfs.c | 1 + fs/nilfs2/the_nilfs.h | 2 ++ 4 files changed, 12 insertions(+), 9 deletions(-) (limited to 'fs/nilfs2/super.c') diff --git a/fs/nilfs2/cpfile.c b/fs/nilfs2/cpfile.c index 300f1cdfa862..cadd36b14d07 100644 --- a/fs/nilfs2/cpfile.c +++ b/fs/nilfs2/cpfile.c @@ -864,11 +864,11 @@ int nilfs_cpfile_change_cpmode(struct inode *cpfile, __u64 cno, int mode) case NILFS_CHECKPOINT: /* * Check for protecting existing snapshot mounts: - * bd_mount_sem is used to make this operation atomic and + * ns_mount_mutex is used to make this operation atomic and * exclusive with a new mount job. Though it doesn't cover * umount, it's enough for the purpose. */ - down(&nilfs->ns_bdev->bd_mount_sem); + mutex_lock(&nilfs->ns_mount_mutex); if (nilfs_checkpoint_is_mounted(nilfs, cno, 1)) { /* Current implementation does not have to protect plain read-only mounts since they are exclusive @@ -877,7 +877,7 @@ int nilfs_cpfile_change_cpmode(struct inode *cpfile, __u64 cno, int mode) ret = -EBUSY; } else ret = nilfs_cpfile_clear_snapshot(cpfile, cno); - up(&nilfs->ns_bdev->bd_mount_sem); + mutex_unlock(&nilfs->ns_mount_mutex); return ret; case NILFS_SNAPSHOT: return nilfs_cpfile_set_snapshot(cpfile, cno); diff --git a/fs/nilfs2/super.c b/fs/nilfs2/super.c index f02762fa8ea0..1777a3467bd2 100644 --- a/fs/nilfs2/super.c +++ b/fs/nilfs2/super.c @@ -764,7 +764,7 @@ int nilfs_store_magic_and_option(struct super_block *sb, * @silent: silent mode flag * @nilfs: the_nilfs struct * - * This function is called exclusively by bd_mount_mutex. + * This function is called exclusively by nilfs->ns_mount_mutex. * So, the recovery process is protected from other simultaneous mounts. */ static int @@ -1105,7 +1105,7 @@ nilfs_get_sb(struct file_system_type *fs_type, int flags, goto failed; } - down(&sd.bdev->bd_mount_sem); + mutex_lock(&nilfs->ns_mount_mutex); if (!sd.cno) { /* @@ -1164,7 +1164,7 @@ nilfs_get_sb(struct file_system_type *fs_type, int flags, need_to_close = 0; } - up(&sd.bdev->bd_mount_sem); + mutex_unlock(&nilfs->ns_mount_mutex); put_nilfs(nilfs); if (need_to_close) close_bdev_exclusive(sd.bdev, flags); @@ -1172,7 +1172,7 @@ nilfs_get_sb(struct file_system_type *fs_type, int flags, return 0; failed_unlock: - up(&sd.bdev->bd_mount_sem); + mutex_unlock(&nilfs->ns_mount_mutex); put_nilfs(nilfs); failed: close_bdev_exclusive(sd.bdev, flags); @@ -1181,14 +1181,14 @@ nilfs_get_sb(struct file_system_type *fs_type, int flags, cancel_new: /* Abandoning the newly allocated superblock */ - up(&sd.bdev->bd_mount_sem); + mutex_unlock(&nilfs->ns_mount_mutex); put_nilfs(nilfs); up_write(&s->s_umount); deactivate_super(s); /* * deactivate_super() invokes close_bdev_exclusive(). * We must finish all post-cleaning before this call; - * put_nilfs() and unlocking bd_mount_sem need the block device. + * put_nilfs() needs the block device. */ return err; } diff --git a/fs/nilfs2/the_nilfs.c b/fs/nilfs2/the_nilfs.c index 06e8dfd538d6..e4e5c78bcc93 100644 --- a/fs/nilfs2/the_nilfs.c +++ b/fs/nilfs2/the_nilfs.c @@ -73,6 +73,7 @@ static struct the_nilfs *alloc_nilfs(struct block_device *bdev) atomic_set(&nilfs->ns_ndirtyblks, 0); init_rwsem(&nilfs->ns_sem); init_rwsem(&nilfs->ns_super_sem); + mutex_init(&nilfs->ns_mount_mutex); mutex_init(&nilfs->ns_writer_mutex); INIT_LIST_HEAD(&nilfs->ns_list); INIT_LIST_HEAD(&nilfs->ns_supers); diff --git a/fs/nilfs2/the_nilfs.h b/fs/nilfs2/the_nilfs.h index d0cf4fb7c9ce..e8adbffc626f 100644 --- a/fs/nilfs2/the_nilfs.h +++ b/fs/nilfs2/the_nilfs.h @@ -49,6 +49,7 @@ enum { * @ns_writer: back pointer to writable nilfs_sb_info * @ns_sem: semaphore for shared states * @ns_super_sem: semaphore for global operations across super block instances + * @ns_mount_mutex: mutex protecting mount process of nilfs * @ns_writer_mutex: mutex protecting ns_writer attach/detach * @ns_writer_refcount: number of referrers on ns_writer * @ns_current: back pointer to current mount @@ -98,6 +99,7 @@ struct the_nilfs { struct nilfs_sb_info *ns_writer; struct rw_semaphore ns_sem; struct rw_semaphore ns_super_sem; + struct mutex ns_mount_mutex; struct mutex ns_writer_mutex; atomic_t ns_writer_refcount; -- cgit v1.2.3