Sanitize ->fsync() for FAT

* mark directory data blocks as assoc. metadata
* add new inode to deal with FAT, mark FAT blocks as assoc. metadata of that
* now ->fsync() is trivial both for files and directories

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

diff --git a/fs/fat/dir.c b/fs/fat/dir.c
index 3a7f603..f350029 100644 (file)
--- a/fs/fat/dir.c
+++ b/fs/fat/dir.c
@@ -840,7 +840,7 @@ const struct file_operations fat_dir_operations = {
 #ifdef CONFIG_COMPAT
        .compat_ioctl   = fat_compat_dir_ioctl,
 #endif
-       .fsync          = file_fsync,
+       .fsync          = fat_file_fsync,
 };
 
 static int fat_get_short_entry(struct inode *dir, loff_t *pos,
@@ -967,7 +967,7 @@ static int __fat_remove_entries(struct inode *dir, loff_t pos, int nr_slots)
                        de++;
                        nr_slots--;
                }
-               mark_buffer_dirty(bh);
+               mark_buffer_dirty_inode(bh, dir);
                if (IS_DIRSYNC(dir))
                        err = sync_dirty_buffer(bh);
                brelse(bh);
@@ -1001,7 +1001,7 @@ int fat_remove_entries(struct inode *dir, struct fat_slot_info *sinfo)
                de--;
                nr_slots--;
        }
-       mark_buffer_dirty(bh);
+       mark_buffer_dirty_inode(bh, dir);
        if (IS_DIRSYNC(dir))
                err = sync_dirty_buffer(bh);
        brelse(bh);
@@ -1051,7 +1051,7 @@ static int fat_zeroed_cluster(struct inode *dir, sector_t blknr, int nr_used,
                }
                memset(bhs[n]->b_data, 0, sb->s_blocksize);
                set_buffer_uptodate(bhs[n]);
-               mark_buffer_dirty(bhs[n]);
+               mark_buffer_dirty_inode(bhs[n], dir);
 
                n++;
                blknr++;
@@ -1131,7 +1131,7 @@ int fat_alloc_new_dir(struct inode *dir, struct timespec *ts)
        de[0].size = de[1].size = 0;
        memset(de + 2, 0, sb->s_blocksize - 2 * sizeof(*de));
        set_buffer_uptodate(bhs[0]);
-       mark_buffer_dirty(bhs[0]);
+       mark_buffer_dirty_inode(bhs[0], dir);
 
        err = fat_zeroed_cluster(dir, blknr, 1, bhs, MAX_BUF_PER_PAGE);
        if (err)
@@ -1193,7 +1193,7 @@ static int fat_add_new_entries(struct inode *dir, void *slots, int nr_slots,
                        slots += copy;
                        size -= copy;
                        set_buffer_uptodate(bhs[n]);
-                       mark_buffer_dirty(bhs[n]);
+                       mark_buffer_dirty_inode(bhs[n], dir);
                        if (!size)
                                break;
                        n++;
@@ -1293,7 +1293,7 @@ found:
                for (i = 0; i < long_bhs; i++) {
                        int copy = min_t(int, sb->s_blocksize - offset, size);
                        memcpy(bhs[i]->b_data + offset, slots, copy);
-                       mark_buffer_dirty(bhs[i]);
+                       mark_buffer_dirty_inode(bhs[i], dir);
                        offset = 0;
                        slots += copy;
                        size -= copy;
@@ -1304,7 +1304,7 @@ found:
                        /* Fill the short name slot. */
                        int copy = min_t(int, sb->s_blocksize - offset, size);
                        memcpy(bhs[i]->b_data + offset, slots, copy);
-                       mark_buffer_dirty(bhs[i]);
+                       mark_buffer_dirty_inode(bhs[i], dir);
                        if (IS_DIRSYNC(dir))
                                err = sync_dirty_buffer(bhs[i]);
                }

diff --git a/fs/fat/fat.h b/fs/fat/fat.h
index ea440d6..e4d8852 100644 (file)
--- a/fs/fat/fat.h
+++ b/fs/fat/fat.h
@@ -74,6 +74,7 @@ struct msdos_sb_info {
 
        int fatent_shift;
        struct fatent_operations *fatent_ops;
+       struct inode *fat_inode;
 
        spinlock_t inode_hash_lock;
        struct hlist_head inode_hashtable[FAT_HASH_SIZE];
@@ -251,6 +252,7 @@ struct fat_entry {
        } u;
        int nr_bhs;
        struct buffer_head *bhs[2];
+       struct inode *fat_inode;
 };
 
 static inline void fatent_init(struct fat_entry *fatent)
@@ -259,6 +261,7 @@ static inline void fatent_init(struct fat_entry *fatent)
        fatent->entry = 0;
        fatent->u.ent32_p = NULL;
        fatent->bhs[0] = fatent->bhs[1] = NULL;
+       fatent->fat_inode = NULL;
 }
 
 static inline void fatent_set_entry(struct fat_entry *fatent, int entry)
@@ -275,6 +278,7 @@ static inline void fatent_brelse(struct fat_entry *fatent)
                brelse(fatent->bhs[i]);
        fatent->nr_bhs = 0;
        fatent->bhs[0] = fatent->bhs[1] = NULL;
+       fatent->fat_inode = NULL;
 }
 
 extern void fat_ent_access_init(struct super_block *sb);
@@ -296,6 +300,8 @@ extern int fat_setattr(struct dentry * dentry, struct iattr * attr);
 extern void fat_truncate(struct inode *inode);
 extern int fat_getattr(struct vfsmount *mnt, struct dentry *dentry,
                       struct kstat *stat);
+extern int fat_file_fsync(struct file *file, struct dentry *dentry,
+                         int datasync);
 
 /* fat/inode.c */
 extern void fat_attach(struct inode *inode, loff_t i_pos);

diff --git a/fs/fat/fatent.c b/fs/fat/fatent.c
index da6eea4..618f530 100644 (file)
--- a/fs/fat/fatent.c
+++ b/fs/fat/fatent.c
@@ -73,6 +73,8 @@ static int fat12_ent_bread(struct super_block *sb, struct fat_entry *fatent,
        struct buffer_head **bhs = fatent->bhs;
 
        WARN_ON(blocknr < MSDOS_SB(sb)->fat_start);
+       fatent->fat_inode = MSDOS_SB(sb)->fat_inode;
+
        bhs[0] = sb_bread(sb, blocknr);
        if (!bhs[0])
                goto err;
@@ -103,6 +105,7 @@ static int fat_ent_bread(struct super_block *sb, struct fat_entry *fatent,
        struct fatent_operations *ops = MSDOS_SB(sb)->fatent_ops;
 
        WARN_ON(blocknr < MSDOS_SB(sb)->fat_start);
+       fatent->fat_inode = MSDOS_SB(sb)->fat_inode;
        fatent->bhs[0] = sb_bread(sb, blocknr);
        if (!fatent->bhs[0]) {
                printk(KERN_ERR "FAT: FAT read failed (blocknr %llu)\n",
@@ -167,9 +170,9 @@ static void fat12_ent_put(struct fat_entry *fatent, int new)
        }
        spin_unlock(&fat12_entry_lock);
 
-       mark_buffer_dirty(fatent->bhs[0]);
+       mark_buffer_dirty_inode(fatent->bhs[0], fatent->fat_inode);
        if (fatent->nr_bhs == 2)
-               mark_buffer_dirty(fatent->bhs[1]);
+               mark_buffer_dirty_inode(fatent->bhs[1], fatent->fat_inode);
 }
 
 static void fat16_ent_put(struct fat_entry *fatent, int new)
@@ -178,7 +181,7 @@ static void fat16_ent_put(struct fat_entry *fatent, int new)
                new = EOF_FAT16;
 
        *fatent->u.ent16_p = cpu_to_le16(new);
-       mark_buffer_dirty(fatent->bhs[0]);
+       mark_buffer_dirty_inode(fatent->bhs[0], fatent->fat_inode);
 }
 
 static void fat32_ent_put(struct fat_entry *fatent, int new)
@@ -189,7 +192,7 @@ static void fat32_ent_put(struct fat_entry *fatent, int new)
        WARN_ON(new & 0xf0000000);
        new |= le32_to_cpu(*fatent->u.ent32_p) & ~0x0fffffff;
        *fatent->u.ent32_p = cpu_to_le32(new);
-       mark_buffer_dirty(fatent->bhs[0]);
+       mark_buffer_dirty_inode(fatent->bhs[0], fatent->fat_inode);
 }
 
 static int fat12_ent_next(struct fat_entry *fatent)
@@ -381,7 +384,7 @@ static int fat_mirror_bhs(struct super_block *sb, struct buffer_head **bhs,
                        }
                        memcpy(c_bh->b_data, bhs[n]->b_data, sb->s_blocksize);
                        set_buffer_uptodate(c_bh);
-                       mark_buffer_dirty(c_bh);
+                       mark_buffer_dirty_inode(c_bh, sbi->fat_inode);
                        if (sb->s_flags & MS_SYNCHRONOUS)
                                err = sync_dirty_buffer(c_bh);
                        brelse(c_bh);

diff --git a/fs/fat/file.c b/fs/fat/file.c
index 0a7f4a9..e955a56 100644 (file)
--- a/fs/fat/file.c
+++ b/fs/fat/file.c
@@ -133,6 +133,18 @@ static int fat_file_release(struct inode *inode, struct file *filp)
        return 0;
 }
 
+int fat_file_fsync(struct file *filp, struct dentry *dentry, int datasync)
+{
+       struct inode *inode = dentry->d_inode;
+       int res, err;
+
+       res = simple_fsync(filp, dentry, datasync);
+       err = sync_mapping_buffers(MSDOS_SB(inode->i_sb)->fat_inode->i_mapping);
+
+       return res ? res : err;
+}
+
+
 const struct file_operations fat_file_operations = {
        .llseek         = generic_file_llseek,
        .read           = do_sync_read,
@@ -142,7 +154,7 @@ const struct file_operations fat_file_operations = {
        .mmap           = generic_file_mmap,
        .release        = fat_file_release,
        .ioctl          = fat_generic_ioctl,
-       .fsync          = file_fsync,
+       .fsync          = fat_file_fsync,
        .splice_read    = generic_file_splice_read,
 };
 

diff --git a/fs/fat/inode.c b/fs/fat/inode.c
index 2292cbf..476f80b 100644 (file)
--- a/fs/fat/inode.c
+++ b/fs/fat/inode.c
@@ -458,6 +458,8 @@ static void fat_put_super(struct super_block *sb)
        if (sb->s_dirt)
                fat_write_super(sb);
 
+       iput(sbi->fat_inode);
+
        if (sbi->nls_disk) {
                unload_nls(sbi->nls_disk);
                sbi->nls_disk = NULL;
@@ -1183,7 +1185,7 @@ static int fat_read_root(struct inode *inode)
 int fat_fill_super(struct super_block *sb, void *data, int silent,
                   const struct inode_operations *fs_dir_inode_ops, int isvfat)
 {
-       struct inode *root_inode = NULL;
+       struct inode *root_inode = NULL, *fat_inode = NULL;
        struct buffer_head *bh;
        struct fat_boot_sector *b;
        struct msdos_sb_info *sbi;
@@ -1423,6 +1425,11 @@ int fat_fill_super(struct super_block *sb, void *data, int silent,
        }
 
        error = -ENOMEM;
+       fat_inode = new_inode(sb);
+       if (!fat_inode)
+               goto out_fail;
+       MSDOS_I(fat_inode)->i_pos = 0;
+       sbi->fat_inode = fat_inode;
        root_inode = new_inode(sb);
        if (!root_inode)
                goto out_fail;
@@ -1448,6 +1455,8 @@ out_invalid:
                       " on dev %s.\n", sb->s_id);
 
 out_fail:
+       if (fat_inode)
+               iput(fat_inode);
        if (root_inode)
                iput(root_inode);
        if (sbi->nls_io)

diff --git a/fs/fat/namei_msdos.c b/fs/fat/namei_msdos.c
index da3f361..20f5228 100644 (file)
--- a/fs/fat/namei_msdos.c
+++ b/fs/fat/namei_msdos.c
@@ -544,7 +544,7 @@ static int do_msdos_rename(struct inode *old_dir, unsigned char *old_name,
                int start = MSDOS_I(new_dir)->i_logstart;
                dotdot_de->start = cpu_to_le16(start);
                dotdot_de->starthi = cpu_to_le16(start >> 16);
-               mark_buffer_dirty(dotdot_bh);
+               mark_buffer_dirty_inode(dotdot_bh, old_inode);
                if (IS_DIRSYNC(new_dir)) {
                        err = sync_dirty_buffer(dotdot_bh);
                        if (err)
@@ -586,7 +586,7 @@ error_dotdot:
                int start = MSDOS_I(old_dir)->i_logstart;
                dotdot_de->start = cpu_to_le16(start);
                dotdot_de->starthi = cpu_to_le16(start >> 16);
-               mark_buffer_dirty(dotdot_bh);
+               mark_buffer_dirty_inode(dotdot_bh, old_inode);
                corrupt |= sync_dirty_buffer(dotdot_bh);
        }
 error_inode:

diff --git a/fs/fat/namei_vfat.c b/fs/fat/namei_vfat.c
index a0e00e3..b50ecbe 100644 (file)
--- a/fs/fat/namei_vfat.c
+++ b/fs/fat/namei_vfat.c
@@ -965,7 +965,7 @@ static int vfat_rename(struct inode *old_dir, struct dentry *old_dentry,
                int start = MSDOS_I(new_dir)->i_logstart;
                dotdot_de->start = cpu_to_le16(start);
                dotdot_de->starthi = cpu_to_le16(start >> 16);
-               mark_buffer_dirty(dotdot_bh);
+               mark_buffer_dirty_inode(dotdot_bh, old_inode);
                if (IS_DIRSYNC(new_dir)) {
                        err = sync_dirty_buffer(dotdot_bh);
                        if (err)
@@ -1009,7 +1009,7 @@ error_dotdot:
                int start = MSDOS_I(old_dir)->i_logstart;
                dotdot_de->start = cpu_to_le16(start);
                dotdot_de->starthi = cpu_to_le16(start >> 16);
-               mark_buffer_dirty(dotdot_bh);
+               mark_buffer_dirty_inode(dotdot_bh, old_inode);
                corrupt |= sync_dirty_buffer(dotdot_bh);
        }
 error_inode: