ufs: sb mutex merge + mutex_destroy

Commit 788257d6101d ("ufs: remove the BKL") replaced BKL with mutex
protection using functions lock_ufs, unlock_ufs and struct mutex 'mutex'
in sb_info.

Commit b6963327e052 ("ufs: drop lock/unlock super") removed lock/unlock
super and added struct mutex 's_lock' in sb_info.

Those 2 mutexes are generally locked/unlocked at the same time except in
allocation (balloc, ialloc).

This patch merges the 2 mutexes and propagates first commit solution.
It also adds mutex destruction before kfree during ufs_fill_super
failure and ufs_put_super.

[akpm@linux-foundation.org: avoid ifdefs, return -EROFS not -EINVAL]
Signed-off-by: Fabian Frederick <fabf@skynet.be>
Cc: Evgeniy Dushistov <dushistov@mail.ru>
Cc: "Chen, Jet" <jet.chen@intel.com>
Cc: Wu Fengguang <fengguang.wu@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/fs/ufs/balloc.c b/fs/ufs/balloc.c
index 184323cac1a4fe120cbf80e6a3a932f9616c9e15..7bc20809c99e3936b232c12b7e0a50913a30b76b 100644 (file)
--- a/fs/ufs/balloc.c
+++ b/fs/ufs/balloc.c
@@ -52,7 +52,7 @@ void ufs_free_fragments(struct inode *inode, u64 fragment, unsigned count)
        if (ufs_fragnum(fragment) + count > uspi->s_fpg)
                ufs_error (sb, "ufs_free_fragments", "internal error");
        
-       mutex_lock(&UFS_SB(sb)->s_lock);
+       lock_ufs(sb);
        
        cgno = ufs_dtog(uspi, fragment);
        bit = ufs_dtogd(uspi, fragment);
@@ -116,12 +116,12 @@ void ufs_free_fragments(struct inode *inode, u64 fragment, unsigned count)
                ubh_sync_block(UCPI_UBH(ucpi));
        ufs_mark_sb_dirty(sb);
        
-       mutex_unlock(&UFS_SB(sb)->s_lock);
+       unlock_ufs(sb);
        UFSD("EXIT\n");
        return;
 
 failed:
-       mutex_unlock(&UFS_SB(sb)->s_lock);
+       unlock_ufs(sb);
        UFSD("EXIT (FAILED)\n");
        return;
 }
@@ -151,7 +151,7 @@ void ufs_free_blocks(struct inode *inode, u64 fragment, unsigned count)
                goto failed;
        }
 
-       mutex_lock(&UFS_SB(sb)->s_lock);
+       lock_ufs(sb);
        
 do_more:
        overflow = 0;
@@ -211,12 +211,12 @@ do_more:
        }
 
        ufs_mark_sb_dirty(sb);
-       mutex_unlock(&UFS_SB(sb)->s_lock);
+       unlock_ufs(sb);
        UFSD("EXIT\n");
        return;
 
 failed_unlock:
-       mutex_unlock(&UFS_SB(sb)->s_lock);
+       unlock_ufs(sb);
 failed:
        UFSD("EXIT (FAILED)\n");
        return;
@@ -357,7 +357,7 @@ u64 ufs_new_fragments(struct inode *inode, void *p, u64 fragment,
        usb1 = ubh_get_usb_first(uspi);
        *err = -ENOSPC;
 
-       mutex_lock(&UFS_SB(sb)->s_lock);
+       lock_ufs(sb);
        tmp = ufs_data_ptr_to_cpu(sb, p);
 
        if (count + ufs_fragnum(fragment) > uspi->s_fpb) {
@@ -378,19 +378,19 @@ u64 ufs_new_fragments(struct inode *inode, void *p, u64 fragment,
                                  "fragment %llu, tmp %llu\n",
                                  (unsigned long long)fragment,
                                  (unsigned long long)tmp);
-                       mutex_unlock(&UFS_SB(sb)->s_lock);
+                       unlock_ufs(sb);
                        return INVBLOCK;
                }
                if (fragment < UFS_I(inode)->i_lastfrag) {
                        UFSD("EXIT (ALREADY ALLOCATED)\n");
-                       mutex_unlock(&UFS_SB(sb)->s_lock);
+                       unlock_ufs(sb);
                        return 0;
                }
        }
        else {
                if (tmp) {
                        UFSD("EXIT (ALREADY ALLOCATED)\n");
-                       mutex_unlock(&UFS_SB(sb)->s_lock);
+                       unlock_ufs(sb);
                        return 0;
                }
        }
@@ -399,7 +399,7 @@ u64 ufs_new_fragments(struct inode *inode, void *p, u64 fragment,
         * There is not enough space for user on the device
         */
        if (!capable(CAP_SYS_RESOURCE) && ufs_freespace(uspi, UFS_MINFREE) <= 0) {
-               mutex_unlock(&UFS_SB(sb)->s_lock);
+               unlock_ufs(sb);
                UFSD("EXIT (FAILED)\n");
                return 0;
        }
@@ -424,7 +424,7 @@ u64 ufs_new_fragments(struct inode *inode, void *p, u64 fragment,
                        ufs_clear_frags(inode, result + oldcount,
                                        newcount - oldcount, locked_page != NULL);
                }
-               mutex_unlock(&UFS_SB(sb)->s_lock);
+               unlock_ufs(sb);
                UFSD("EXIT, result %llu\n", (unsigned long long)result);
                return result;
        }
@@ -439,7 +439,7 @@ u64 ufs_new_fragments(struct inode *inode, void *p, u64 fragment,
                                                fragment + count);
                ufs_clear_frags(inode, result + oldcount, newcount - oldcount,
                                locked_page != NULL);
-               mutex_unlock(&UFS_SB(sb)->s_lock);
+               unlock_ufs(sb);
                UFSD("EXIT, result %llu\n", (unsigned long long)result);
                return result;
        }
@@ -477,7 +477,7 @@ u64 ufs_new_fragments(struct inode *inode, void *p, u64 fragment,
                *err = 0;
                UFS_I(inode)->i_lastfrag = max(UFS_I(inode)->i_lastfrag,
                                                fragment + count);
-               mutex_unlock(&UFS_SB(sb)->s_lock);
+               unlock_ufs(sb);
                if (newcount < request)
                        ufs_free_fragments (inode, result + newcount, request - newcount);
                ufs_free_fragments (inode, tmp, oldcount);
@@ -485,7 +485,7 @@ u64 ufs_new_fragments(struct inode *inode, void *p, u64 fragment,
                return result;
        }
 
-       mutex_unlock(&UFS_SB(sb)->s_lock);
+       unlock_ufs(sb);
        UFSD("EXIT (FAILED)\n");
        return 0;
 }              

diff --git a/fs/ufs/ialloc.c b/fs/ufs/ialloc.c
index 98f7211599ffe747f15a9d916ccdb14e0cd3592a..a9cc75ffa925f995c35bc592651681ee3ff63e24 100644 (file)
--- a/fs/ufs/ialloc.c
+++ b/fs/ufs/ialloc.c
@@ -69,11 +69,11 @@ void ufs_free_inode (struct inode * inode)
        
        ino = inode->i_ino;
 
-       mutex_lock(&UFS_SB(sb)->s_lock);
+       lock_ufs(sb);
 
        if (!((ino > 1) && (ino < (uspi->s_ncg * uspi->s_ipg )))) {
                ufs_warning(sb, "ufs_free_inode", "reserved inode or nonexistent inode %u\n", ino);
-               mutex_unlock(&UFS_SB(sb)->s_lock);
+               unlock_ufs(sb);
                return;
        }
        
@@ -81,7 +81,7 @@ void ufs_free_inode (struct inode * inode)
        bit = ufs_inotocgoff (ino);
        ucpi = ufs_load_cylinder (sb, cg);
        if (!ucpi) {
-               mutex_unlock(&UFS_SB(sb)->s_lock);
+               unlock_ufs(sb);
                return;
        }
        ucg = ubh_get_ucg(UCPI_UBH(ucpi));
@@ -115,7 +115,7 @@ void ufs_free_inode (struct inode * inode)
                ubh_sync_block(UCPI_UBH(ucpi));
        
        ufs_mark_sb_dirty(sb);
-       mutex_unlock(&UFS_SB(sb)->s_lock);
+       unlock_ufs(sb);
        UFSD("EXIT\n");
 }
 
@@ -193,7 +193,7 @@ struct inode *ufs_new_inode(struct inode *dir, umode_t mode)
        sbi = UFS_SB(sb);
        uspi = sbi->s_uspi;
 
-       mutex_lock(&sbi->s_lock);
+       lock_ufs(sb);
 
        /*
         * Try to place the inode in its parent directory
@@ -328,21 +328,20 @@ cg_found:
                        sync_dirty_buffer(bh);
                brelse(bh);
        }
-
-       mutex_unlock(&sbi->s_lock);
+       unlock_ufs(sb);
 
        UFSD("allocating inode %lu\n", inode->i_ino);
        UFSD("EXIT\n");
        return inode;
 
 fail_remove_inode:
-       mutex_unlock(&sbi->s_lock);
+       unlock_ufs(sb);
        clear_nlink(inode);
        iput(inode);
        UFSD("EXIT (FAILED): err %d\n", err);
        return ERR_PTR(err);
 failed:
-       mutex_unlock(&sbi->s_lock);
+       unlock_ufs(sb);
        make_bad_inode(inode);
        iput (inode);
        UFSD("EXIT (FAILED): err %d\n", err);

diff --git a/fs/ufs/super.c b/fs/ufs/super.c
index c1183f9f69dc71c3089951898043c582181092fd..b879f1ba34398c4b46c2f80f3f18b33c7447b4fb 100644 (file)
--- a/fs/ufs/super.c
+++ b/fs/ufs/super.c
@@ -697,7 +697,6 @@ static int ufs_sync_fs(struct super_block *sb, int wait)
        unsigned flags;
 
        lock_ufs(sb);
-       mutex_lock(&UFS_SB(sb)->s_lock);
 
        UFSD("ENTER\n");
 
@@ -715,7 +714,6 @@ static int ufs_sync_fs(struct super_block *sb, int wait)
        ufs_put_cstotal(sb);
 
        UFSD("EXIT\n");
-       mutex_unlock(&UFS_SB(sb)->s_lock);
        unlock_ufs(sb);
 
        return 0;
@@ -760,6 +758,7 @@ static void ufs_put_super(struct super_block *sb)
 
        ubh_brelse_uspi (sbi->s_uspi);
        kfree (sbi->s_uspi);
+       mutex_destroy(&sbi->mutex);
        kfree (sbi);
        sb->s_fs_info = NULL;
        UFSD("EXIT\n");
@@ -786,6 +785,14 @@ static int ufs_fill_super(struct super_block *sb, void *data, int silent)
        flags = 0;
        
        UFSD("ENTER\n");
+
+#ifndef CONFIG_UFS_FS_WRITE
+       if (!(sb->s_flags & MS_RDONLY)) {
+               printk("ufs was compiled with read-only support, "
+                      "can't be mounted as read-write\n");
+               return -EROFS;
+       }
+#endif
                
        sbi = kzalloc(sizeof(struct ufs_sb_info), GFP_KERNEL);
        if (!sbi)
@@ -795,15 +802,7 @@ static int ufs_fill_super(struct super_block *sb, void *data, int silent)
 
        UFSD("flag %u\n", (int)(sb->s_flags & MS_RDONLY));
        
-#ifndef CONFIG_UFS_FS_WRITE
-       if (!(sb->s_flags & MS_RDONLY)) {
-               printk("ufs was compiled with read-only support, "
-               "can't be mounted as read-write\n");
-               goto failed;
-       }
-#endif
        mutex_init(&sbi->mutex);
-       mutex_init(&sbi->s_lock);
        spin_lock_init(&sbi->work_lock);
        INIT_DELAYED_WORK(&sbi->sync_work, delayed_sync_fs);
        /*
@@ -1257,6 +1256,7 @@ magic_found:
        return 0;
 
 failed:
+       mutex_destroy(&sbi->mutex);
        if (ubh)
                ubh_brelse_uspi (uspi);
        kfree (uspi);
@@ -1280,7 +1280,6 @@ static int ufs_remount (struct super_block *sb, int *mount_flags, char *data)
 
        sync_filesystem(sb);
        lock_ufs(sb);
-       mutex_lock(&UFS_SB(sb)->s_lock);
        uspi = UFS_SB(sb)->s_uspi;
        flags = UFS_SB(sb)->s_flags;
        usb1 = ubh_get_usb_first(uspi);
@@ -1294,7 +1293,6 @@ static int ufs_remount (struct super_block *sb, int *mount_flags, char *data)
        new_mount_opt = 0;
        ufs_set_opt (new_mount_opt, ONERROR_LOCK);
        if (!ufs_parse_options (data, &new_mount_opt)) {
-               mutex_unlock(&UFS_SB(sb)->s_lock);
                unlock_ufs(sb);
                return -EINVAL;
        }
@@ -1302,14 +1300,12 @@ static int ufs_remount (struct super_block *sb, int *mount_flags, char *data)
                new_mount_opt |= ufstype;
        } else if ((new_mount_opt & UFS_MOUNT_UFSTYPE) != ufstype) {
                printk("ufstype can't be changed during remount\n");
-               mutex_unlock(&UFS_SB(sb)->s_lock);
                unlock_ufs(sb);
                return -EINVAL;
        }
 
        if ((*mount_flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY)) {
                UFS_SB(sb)->s_mount_opt = new_mount_opt;
-               mutex_unlock(&UFS_SB(sb)->s_lock);
                unlock_ufs(sb);
                return 0;
        }
@@ -1334,7 +1330,6 @@ static int ufs_remount (struct super_block *sb, int *mount_flags, char *data)
 #ifndef CONFIG_UFS_FS_WRITE
                printk("ufs was compiled with read-only support, "
                "can't be mounted as read-write\n");
-               mutex_unlock(&UFS_SB(sb)->s_lock);
                unlock_ufs(sb);
                return -EINVAL;
 #else
@@ -1344,13 +1339,11 @@ static int ufs_remount (struct super_block *sb, int *mount_flags, char *data)
                    ufstype != UFS_MOUNT_UFSTYPE_SUNx86 &&
                    ufstype != UFS_MOUNT_UFSTYPE_UFS2) {
                        printk("this ufstype is read-only supported\n");
-                       mutex_unlock(&UFS_SB(sb)->s_lock);
                        unlock_ufs(sb);
                        return -EINVAL;
                }
                if (!ufs_read_cylinder_structures(sb)) {
                        printk("failed during remounting\n");
-                       mutex_unlock(&UFS_SB(sb)->s_lock);
                        unlock_ufs(sb);
                        return -EPERM;
                }
@@ -1358,7 +1351,6 @@ static int ufs_remount (struct super_block *sb, int *mount_flags, char *data)
 #endif
        }
        UFS_SB(sb)->s_mount_opt = new_mount_opt;
-       mutex_unlock(&UFS_SB(sb)->s_lock);
        unlock_ufs(sb);
        return 0;
 }

diff --git a/fs/ufs/ufs.h b/fs/ufs/ufs.h
index ff2c15ab81aaa05c06409966c03f9bb912e87c4a..343e6fc571e5b3976b6132d43dccb03b538d9380 100644 (file)
--- a/fs/ufs/ufs.h
+++ b/fs/ufs/ufs.h
@@ -24,7 +24,6 @@ struct ufs_sb_info {
        int work_queued; /* non-zero if the delayed work is queued */
        struct delayed_work sync_work; /* FS sync delayed work */
        spinlock_t work_lock; /* protects sync_work and work_queued */
-       struct mutex s_lock;
 };
 
 struct ufs_inode_info {