vfs: check i_nlink limits in vfs_{mkdir,rename_dir,link}

New field of struct super_block - ->s_max_links.  Maximal allowed
value of ->i_nlink or 0; in the latter case all checks still need
to be done in ->link/->mkdir/->rename instances.  Note that this
limit applies both to directoris and to non-directories.

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

diff --git a/fs/exofs/namei.c b/fs/exofs/namei.c
index 9dbf0c3..fc7161d 100644 (file)
--- a/fs/exofs/namei.c
+++ b/fs/exofs/namei.c
@@ -143,9 +143,6 @@ static int exofs_link(struct dentry *old_dentry, struct inode *dir,
 {
        struct inode *inode = old_dentry->d_inode;
 
-       if (inode->i_nlink >= EXOFS_LINK_MAX)
-               return -EMLINK;
-
        inode->i_ctime = CURRENT_TIME;
        inode_inc_link_count(inode);
        ihold(inode);
@@ -156,10 +153,7 @@ static int exofs_link(struct dentry *old_dentry, struct inode *dir,
 static int exofs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
 {
        struct inode *inode;
-       int err = -EMLINK;
-
-       if (dir->i_nlink >= EXOFS_LINK_MAX)
-               goto out;
+       int err;
 
        inode_inc_link_count(dir);
 
@@ -275,11 +269,6 @@ static int exofs_rename(struct inode *old_dir, struct dentry *old_dentry,
                if (err)
                        goto out_dir;
        } else {
-               if (dir_de) {
-                       err = -EMLINK;
-                       if (new_dir->i_nlink >= EXOFS_LINK_MAX)
-                               goto out_dir;
-               }
                err = exofs_add_link(new_dentry, old_inode);
                if (err)
                        goto out_dir;

diff --git a/fs/exofs/super.c b/fs/exofs/super.c
index d22cd16..6cafcad 100644 (file)
--- a/fs/exofs/super.c
+++ b/fs/exofs/super.c
@@ -754,6 +754,7 @@ static int exofs_fill_super(struct super_block *sb, void *data, int silent)
        sb->s_blocksize = EXOFS_BLKSIZE;
        sb->s_blocksize_bits = EXOFS_BLKSHIFT;
        sb->s_maxbytes = MAX_LFS_FILESIZE;
+       sb->s_max_links = EXOFS_LINK_MAX;
        atomic_set(&sbi->s_curr_pending, 0);
        sb->s_bdev = NULL;
        sb->s_dev = 0;

diff --git a/fs/ext2/namei.c b/fs/ext2/namei.c
index 0804198..dffb865 100644 (file)
--- a/fs/ext2/namei.c
+++ b/fs/ext2/namei.c
@@ -195,9 +195,6 @@ static int ext2_link (struct dentry * old_dentry, struct inode * dir,
        struct inode *inode = old_dentry->d_inode;
        int err;
 
-       if (inode->i_nlink >= EXT2_LINK_MAX)
-               return -EMLINK;
-
        dquot_initialize(dir);
 
        inode->i_ctime = CURRENT_TIME_SEC;
@@ -217,10 +214,7 @@ static int ext2_link (struct dentry * old_dentry, struct inode * dir,
 static int ext2_mkdir(struct inode * dir, struct dentry * dentry, umode_t mode)
 {
        struct inode * inode;
-       int err = -EMLINK;
-
-       if (dir->i_nlink >= EXT2_LINK_MAX)
-               goto out;
+       int err;
 
        dquot_initialize(dir);
 
@@ -346,11 +340,6 @@ static int ext2_rename (struct inode * old_dir, struct dentry * old_dentry,
                        drop_nlink(new_inode);
                inode_dec_link_count(new_inode);
        } else {
-               if (dir_de) {
-                       err = -EMLINK;
-                       if (new_dir->i_nlink >= EXT2_LINK_MAX)
-                               goto out_dir;
-               }
                err = ext2_add_link(new_dentry, old_inode);
                if (err)
                        goto out_dir;

diff --git a/fs/ext2/super.c b/fs/ext2/super.c
index 0090595..9f6766a 100644 (file)
--- a/fs/ext2/super.c
+++ b/fs/ext2/super.c
@@ -919,6 +919,7 @@ static int ext2_fill_super(struct super_block *sb, void *data, int silent)
        }
 
        sb->s_maxbytes = ext2_max_size(sb->s_blocksize_bits);
+       sb->s_max_links = EXT2_LINK_MAX;
 
        if (le32_to_cpu(es->s_rev_level) == EXT2_GOOD_OLD_REV) {
                sbi->s_inode_size = EXT2_GOOD_OLD_INODE_SIZE;

diff --git a/fs/jfs/namei.c b/fs/jfs/namei.c
index 5f7c160..07c91ca 100644 (file)
--- a/fs/jfs/namei.c
+++ b/fs/jfs/namei.c
@@ -220,12 +220,6 @@ static int jfs_mkdir(struct inode *dip, struct dentry *dentry, umode_t mode)
 
        dquot_initialize(dip);
 
-       /* link count overflow on parent directory ? */
-       if (dip->i_nlink == JFS_LINK_MAX) {
-               rc = -EMLINK;
-               goto out1;
-       }
-
        /*
         * search parent directory for entry/freespace
         * (dtSearch() returns parent directory page pinned)
@@ -806,9 +800,6 @@ static int jfs_link(struct dentry *old_dentry,
        jfs_info("jfs_link: %s %s", old_dentry->d_name.name,
                 dentry->d_name.name);
 
-       if (ip->i_nlink == JFS_LINK_MAX)
-               return -EMLINK;
-
        dquot_initialize(dir);
 
        tid = txBegin(ip->i_sb, 0);
@@ -1138,10 +1129,6 @@ static int jfs_rename(struct inode *old_dir, struct dentry *old_dentry,
                                rc = -ENOTEMPTY;
                                goto out3;
                        }
-               } else if ((new_dir != old_dir) &&
-                          (new_dir->i_nlink == JFS_LINK_MAX)) {
-                       rc = -EMLINK;
-                       goto out3;
                }
        } else if (new_ip) {
                IWRITE_LOCK(new_ip, RDWRLOCK_NORMAL);

diff --git a/fs/jfs/super.c b/fs/jfs/super.c
index 682bca6..4661ad7 100644 (file)
--- a/fs/jfs/super.c
+++ b/fs/jfs/super.c
@@ -441,6 +441,7 @@ static int jfs_fill_super(struct super_block *sb, void *data, int silent)
                return -ENOMEM;
 
        sb->s_fs_info = sbi;
+       sb->s_max_links = JFS_LINK_MAX;
        sbi->sb = sb;
        sbi->uid = sbi->gid = sbi->umask = -1;
 

diff --git a/fs/logfs/dir.c b/fs/logfs/dir.c
index 3de7a32..4aea231 100644 (file)
--- a/fs/logfs/dir.c
+++ b/fs/logfs/dir.c
@@ -558,9 +558,6 @@ static int logfs_link(struct dentry *old_dentry, struct inode *dir,
 {
        struct inode *inode = old_dentry->d_inode;
 
-       if (inode->i_nlink >= LOGFS_LINK_MAX)
-               return -EMLINK;
-
        inode->i_ctime = dir->i_ctime = dir->i_mtime = CURRENT_TIME;
        ihold(inode);
        inc_nlink(inode);

diff --git a/fs/logfs/super.c b/fs/logfs/super.c
index c9ee7f5..b1a491a 100644 (file)
--- a/fs/logfs/super.c
+++ b/fs/logfs/super.c
@@ -542,6 +542,7 @@ static struct dentry *logfs_get_sb_device(struct logfs_super *super,
         * the filesystem incompatible with 32bit systems.
         */
        sb->s_maxbytes  = (1ull << 43) - 1;
+       sb->s_max_links = LOGFS_LINK_MAX;
        sb->s_op        = &logfs_super_operations;
        sb->s_flags     = flags | MS_NOATIME;
 

diff --git a/fs/minix/inode.c b/fs/minix/inode.c
index fa8b612..62c697c 100644 (file)
--- a/fs/minix/inode.c
+++ b/fs/minix/inode.c
@@ -190,24 +190,24 @@ static int minix_fill_super(struct super_block *s, void *data, int silent)
                sbi->s_version = MINIX_V1;
                sbi->s_dirsize = 16;
                sbi->s_namelen = 14;
-               sbi->s_link_max = MINIX_LINK_MAX;
+               s->s_max_links = MINIX_LINK_MAX;
        } else if (s->s_magic == MINIX_SUPER_MAGIC2) {
                sbi->s_version = MINIX_V1;
                sbi->s_dirsize = 32;
                sbi->s_namelen = 30;
-               sbi->s_link_max = MINIX_LINK_MAX;
+               s->s_max_links = MINIX_LINK_MAX;
        } else if (s->s_magic == MINIX2_SUPER_MAGIC) {
                sbi->s_version = MINIX_V2;
                sbi->s_nzones = ms->s_zones;
                sbi->s_dirsize = 16;
                sbi->s_namelen = 14;
-               sbi->s_link_max = MINIX2_LINK_MAX;
+               s->s_max_links = MINIX2_LINK_MAX;
        } else if (s->s_magic == MINIX2_SUPER_MAGIC2) {
                sbi->s_version = MINIX_V2;
                sbi->s_nzones = ms->s_zones;
                sbi->s_dirsize = 32;
                sbi->s_namelen = 30;
-               sbi->s_link_max = MINIX2_LINK_MAX;
+               s->s_max_links = MINIX2_LINK_MAX;
        } else if ( *(__u16 *)(bh->b_data + 24) == MINIX3_SUPER_MAGIC) {
                m3s = (struct minix3_super_block *) bh->b_data;
                s->s_magic = m3s->s_magic;
@@ -221,9 +221,9 @@ static int minix_fill_super(struct super_block *s, void *data, int silent)
                sbi->s_dirsize = 64;
                sbi->s_namelen = 60;
                sbi->s_version = MINIX_V3;
-               sbi->s_link_max = MINIX2_LINK_MAX;
                sbi->s_mount_state = MINIX_VALID_FS;
                sb_set_blocksize(s, m3s->s_blocksize);
+               s->s_max_links = MINIX2_LINK_MAX;
        } else
                goto out_no_fs;
 

diff --git a/fs/minix/minix.h b/fs/minix/minix.h
index c889ef0..1ebd118 100644 (file)
--- a/fs/minix/minix.h
+++ b/fs/minix/minix.h
@@ -34,7 +34,6 @@ struct minix_sb_info {
        unsigned long s_max_size;
        int s_dirsize;
        int s_namelen;
-       int s_link_max;
        struct buffer_head ** s_imap;
        struct buffer_head ** s_zmap;
        struct buffer_head * s_sbh;

diff --git a/fs/minix/namei.c b/fs/minix/namei.c
index 2f76e38..2d0ee17 100644 (file)
--- a/fs/minix/namei.c
+++ b/fs/minix/namei.c
@@ -94,9 +94,6 @@ static int minix_link(struct dentry * old_dentry, struct inode * dir,
 {
        struct inode *inode = old_dentry->d_inode;
 
-       if (inode->i_nlink >= minix_sb(inode->i_sb)->s_link_max)
-               return -EMLINK;
-
        inode->i_ctime = CURRENT_TIME_SEC;
        inode_inc_link_count(inode);
        ihold(inode);
@@ -106,10 +103,7 @@ static int minix_link(struct dentry * old_dentry, struct inode * dir,
 static int minix_mkdir(struct inode * dir, struct dentry *dentry, umode_t mode)
 {
        struct inode * inode;
-       int err = -EMLINK;
-
-       if (dir->i_nlink >= minix_sb(dir->i_sb)->s_link_max)
-               goto out;
+       int err;
 
        inode_inc_link_count(dir);
 
@@ -181,7 +175,6 @@ static int minix_rmdir(struct inode * dir, struct dentry *dentry)
 static int minix_rename(struct inode * old_dir, struct dentry *old_dentry,
                           struct inode * new_dir, struct dentry *new_dentry)
 {
-       struct minix_sb_info * info = minix_sb(old_dir->i_sb);
        struct inode * old_inode = old_dentry->d_inode;
        struct inode * new_inode = new_dentry->d_inode;
        struct page * dir_page = NULL;
@@ -219,11 +212,6 @@ static int minix_rename(struct inode * old_dir, struct dentry *old_dentry,
                        drop_nlink(new_inode);
                inode_dec_link_count(new_inode);
        } else {
-               if (dir_de) {
-                       err = -EMLINK;
-                       if (new_dir->i_nlink >= info->s_link_max)
-                               goto out_dir;
-               }
                err = minix_add_link(new_dentry, old_inode);
                if (err)
                        goto out_dir;

diff --git a/fs/namei.c b/fs/namei.c
index 46ea9cc..a0b8276 100644 (file)
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -2569,6 +2569,7 @@ SYSCALL_DEFINE3(mknod, const char __user *, filename, umode_t, mode, unsigned, d
 int vfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
 {
        int error = may_create(dir, dentry);
+       unsigned max_links = dir->i_sb->s_max_links;
 
        if (error)
                return error;
@@ -2581,6 +2582,9 @@ int vfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
        if (error)
                return error;
 
+       if (max_links && dir->i_nlink >= max_links)
+               return -EMLINK;
+
        error = dir->i_op->mkdir(dir, dentry, mode);
        if (!error)
                fsnotify_mkdir(dir, dentry);
@@ -2911,6 +2915,7 @@ SYSCALL_DEFINE2(symlink, const char __user *, oldname, const char __user *, newn
 int vfs_link(struct dentry *old_dentry, struct inode *dir, struct dentry *new_dentry)
 {
        struct inode *inode = old_dentry->d_inode;
+       unsigned max_links = dir->i_sb->s_max_links;
        int error;
 
        if (!inode)
@@ -2941,6 +2946,8 @@ int vfs_link(struct dentry *old_dentry, struct inode *dir, struct dentry *new_de
        /* Make sure we don't allow creating hardlink to an unlinked file */
        if (inode->i_nlink == 0)
                error =  -ENOENT;
+       else if (max_links && inode->i_nlink >= max_links)
+               error = -EMLINK;
        else
                error = dir->i_op->link(old_dentry, dir, new_dentry);
        mutex_unlock(&inode->i_mutex);
@@ -3050,6 +3057,7 @@ static int vfs_rename_dir(struct inode *old_dir, struct dentry *old_dentry,
 {
        int error = 0;
        struct inode *target = new_dentry->d_inode;
+       unsigned max_links = new_dir->i_sb->s_max_links;
 
        /*
         * If we are going to change the parent - check write permissions,
@@ -3073,6 +3081,11 @@ static int vfs_rename_dir(struct inode *old_dir, struct dentry *old_dentry,
        if (d_mountpoint(old_dentry) || d_mountpoint(new_dentry))
                goto out;
 
+       error = -EMLINK;
+       if (max_links && !target && new_dir != old_dir &&
+           new_dir->i_nlink >= max_links)
+               goto out;
+
        if (target)
                shrink_dcache_parent(new_dentry);
        error = old_dir->i_op->rename(old_dir, old_dentry, new_dir, new_dentry);

diff --git a/fs/nilfs2/namei.c b/fs/nilfs2/namei.c
index 1cd3f62..fce2bbe 100644 (file)
--- a/fs/nilfs2/namei.c
+++ b/fs/nilfs2/namei.c
@@ -193,9 +193,6 @@ static int nilfs_link(struct dentry *old_dentry, struct inode *dir,
        struct nilfs_transaction_info ti;
        int err;
 
-       if (inode->i_nlink >= NILFS_LINK_MAX)
-               return -EMLINK;
-
        err = nilfs_transaction_begin(dir->i_sb, &ti, 1);
        if (err)
                return err;
@@ -219,9 +216,6 @@ static int nilfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
        struct nilfs_transaction_info ti;
        int err;
 
-       if (dir->i_nlink >= NILFS_LINK_MAX)
-               return -EMLINK;
-
        err = nilfs_transaction_begin(dir->i_sb, &ti, 1);
        if (err)
                return err;
@@ -400,11 +394,6 @@ static int nilfs_rename(struct inode *old_dir, struct dentry *old_dentry,
                drop_nlink(new_inode);
                nilfs_mark_inode_dirty(new_inode);
        } else {
-               if (dir_de) {
-                       err = -EMLINK;
-                       if (new_dir->i_nlink >= NILFS_LINK_MAX)
-                               goto out_dir;
-               }
                err = nilfs_add_link(new_dentry, old_inode);
                if (err)
                        goto out_dir;

diff --git a/fs/nilfs2/super.c b/fs/nilfs2/super.c
index 08e3d4f..1fc9ad3 100644 (file)
--- a/fs/nilfs2/super.c
+++ b/fs/nilfs2/super.c
@@ -1059,6 +1059,7 @@ nilfs_fill_super(struct super_block *sb, void *data, int silent)
        sb->s_export_op = &nilfs_export_ops;
        sb->s_root = NULL;
        sb->s_time_gran = 1;
+       sb->s_max_links = NILFS_LINK_MAX;
 
        bdi = sb->s_bdev->bd_inode->i_mapping->backing_dev_info;
        sb->s_bdi = bdi ? : &default_backing_dev_info;

diff --git a/fs/sysv/namei.c b/fs/sysv/namei.c
index b217797..d7466e2 100644 (file)
--- a/fs/sysv/namei.c
+++ b/fs/sysv/namei.c
@@ -121,9 +121,6 @@ static int sysv_link(struct dentry * old_dentry, struct inode * dir,
 {
        struct inode *inode = old_dentry->d_inode;
 
-       if (inode->i_nlink >= SYSV_SB(inode->i_sb)->s_link_max)
-               return -EMLINK;
-
        inode->i_ctime = CURRENT_TIME_SEC;
        inode_inc_link_count(inode);
        ihold(inode);
@@ -134,10 +131,8 @@ static int sysv_link(struct dentry * old_dentry, struct inode * dir,
 static int sysv_mkdir(struct inode * dir, struct dentry *dentry, umode_t mode)
 {
        struct inode * inode;
-       int err = -EMLINK;
+       int err;
 
-       if (dir->i_nlink >= SYSV_SB(dir->i_sb)->s_link_max) 
-               goto out;
        inode_inc_link_count(dir);
 
        inode = sysv_new_inode(dir, S_IFDIR|mode);
@@ -251,11 +246,6 @@ static int sysv_rename(struct inode * old_dir, struct dentry * old_dentry,
                        drop_nlink(new_inode);
                inode_dec_link_count(new_inode);
        } else {
-               if (dir_de) {
-                       err = -EMLINK;
-                       if (new_dir->i_nlink >= SYSV_SB(new_dir->i_sb)->s_link_max)
-                               goto out_dir;
-               }
                err = sysv_add_link(new_dentry, old_inode);
                if (err)
                        goto out_dir;

diff --git a/fs/sysv/super.c b/fs/sysv/super.c
index f60c196..f467740 100644 (file)
--- a/fs/sysv/super.c
+++ b/fs/sysv/super.c
@@ -44,7 +44,7 @@ enum {
        JAN_1_1980 = (10*365 + 2) * 24 * 60 * 60
 };
 
-static void detected_xenix(struct sysv_sb_info *sbi)
+static void detected_xenix(struct sysv_sb_info *sbi, unsigned *max_links)
 {
        struct buffer_head *bh1 = sbi->s_bh1;
        struct buffer_head *bh2 = sbi->s_bh2;
@@ -59,7 +59,7 @@ static void detected_xenix(struct sysv_sb_info *sbi)
                sbd2 = (struct xenix_super_block *) (bh2->b_data - 512);
        }
 
-       sbi->s_link_max = XENIX_LINK_MAX;
+       *max_links = XENIX_LINK_MAX;
        sbi->s_fic_size = XENIX_NICINOD;
        sbi->s_flc_size = XENIX_NICFREE;
        sbi->s_sbd1 = (char *)sbd1;
@@ -75,7 +75,7 @@ static void detected_xenix(struct sysv_sb_info *sbi)
        sbi->s_nzones = fs32_to_cpu(sbi, sbd1->s_fsize);
 }
 
-static void detected_sysv4(struct sysv_sb_info *sbi)
+static void detected_sysv4(struct sysv_sb_info *sbi, unsigned *max_links)
 {
        struct sysv4_super_block * sbd;
        struct buffer_head *bh1 = sbi->s_bh1;
@@ -86,7 +86,7 @@ static void detected_sysv4(struct sysv_sb_info *sbi)
        else
                sbd = (struct sysv4_super_block *) bh2->b_data;
 
-       sbi->s_link_max = SYSV_LINK_MAX;
+       *max_links = SYSV_LINK_MAX;
        sbi->s_fic_size = SYSV_NICINOD;
        sbi->s_flc_size = SYSV_NICFREE;
        sbi->s_sbd1 = (char *)sbd;
@@ -103,7 +103,7 @@ static void detected_sysv4(struct sysv_sb_info *sbi)
        sbi->s_nzones = fs32_to_cpu(sbi, sbd->s_fsize);
 }
 
-static void detected_sysv2(struct sysv_sb_info *sbi)
+static void detected_sysv2(struct sysv_sb_info *sbi, unsigned *max_links)
 {
        struct sysv2_super_block *sbd;
        struct buffer_head *bh1 = sbi->s_bh1;
@@ -114,7 +114,7 @@ static void detected_sysv2(struct sysv_sb_info *sbi)
        else
                sbd = (struct sysv2_super_block *) bh2->b_data;
 
-       sbi->s_link_max = SYSV_LINK_MAX;
+       *max_links = SYSV_LINK_MAX;
        sbi->s_fic_size = SYSV_NICINOD;
        sbi->s_flc_size = SYSV_NICFREE;
        sbi->s_sbd1 = (char *)sbd;
@@ -131,14 +131,14 @@ static void detected_sysv2(struct sysv_sb_info *sbi)
        sbi->s_nzones = fs32_to_cpu(sbi, sbd->s_fsize);
 }
 
-static void detected_coherent(struct sysv_sb_info *sbi)
+static void detected_coherent(struct sysv_sb_info *sbi, unsigned *max_links)
 {
        struct coh_super_block * sbd;
        struct buffer_head *bh1 = sbi->s_bh1;
 
        sbd = (struct coh_super_block *) bh1->b_data;
 
-       sbi->s_link_max = COH_LINK_MAX;
+       *max_links = COH_LINK_MAX;
        sbi->s_fic_size = COH_NICINOD;
        sbi->s_flc_size = COH_NICFREE;
        sbi->s_sbd1 = (char *)sbd;
@@ -154,12 +154,12 @@ static void detected_coherent(struct sysv_sb_info *sbi)
        sbi->s_nzones = fs32_to_cpu(sbi, sbd->s_fsize);
 }
 
-static void detected_v7(struct sysv_sb_info *sbi)
+static void detected_v7(struct sysv_sb_info *sbi, unsigned *max_links)
 {
        struct buffer_head *bh2 = sbi->s_bh2;
        struct v7_super_block *sbd = (struct v7_super_block *)bh2->b_data;
 
-       sbi->s_link_max = V7_LINK_MAX;
+       *max_links = V7_LINK_MAX;
        sbi->s_fic_size = V7_NICINOD;
        sbi->s_flc_size = V7_NICFREE;
        sbi->s_sbd1 = (char *)sbd;
@@ -290,7 +290,7 @@ static char *flavour_names[] = {
        [FSTYPE_AFS]    = "AFS",
 };
 
-static void (*flavour_setup[])(struct sysv_sb_info *) = {
+static void (*flavour_setup[])(struct sysv_sb_info *, unsigned *) = {
        [FSTYPE_XENIX]  = detected_xenix,
        [FSTYPE_SYSV4]  = detected_sysv4,
        [FSTYPE_SYSV2]  = detected_sysv2,
@@ -310,7 +310,7 @@ static int complete_read_super(struct super_block *sb, int silent, int size)
 
        sbi->s_firstinodezone = 2;
 
-       flavour_setup[sbi->s_type](sbi);
+       flavour_setup[sbi->s_type](sbi, &sb->s_max_links);
        
        sbi->s_truncate = 1;
        sbi->s_ndatazones = sbi->s_nzones - sbi->s_firstdatazone;

diff --git a/fs/sysv/sysv.h b/fs/sysv/sysv.h
index 0e4b821..11b0767 100644 (file)
--- a/fs/sysv/sysv.h
+++ b/fs/sysv/sysv.h
@@ -24,7 +24,6 @@ struct sysv_sb_info {
        char           s_bytesex;       /* bytesex (le/be/pdp) */
        char           s_truncate;      /* if 1: names > SYSV_NAMELEN chars are truncated */
                                        /* if 0: they are disallowed (ENAMETOOLONG) */
-       nlink_t        s_link_max;      /* max number of hard links to a file */
        unsigned int   s_inodes_per_block;      /* number of inodes per block */
        unsigned int   s_inodes_per_block_1;    /* inodes_per_block - 1 */
        unsigned int   s_inodes_per_block_bits; /* log2(inodes_per_block) */

diff --git a/fs/udf/namei.c b/fs/udf/namei.c
index 08bf46e..38de8f2 100644 (file)
--- a/fs/udf/namei.c
+++ b/fs/udf/namei.c
@@ -32,8 +32,6 @@
 #include <linux/crc-itu-t.h>
 #include <linux/exportfs.h>
 
-enum { UDF_MAX_LINKS = 0xffff };
-
 static inline int udf_match(int len1, const unsigned char *name1, int len2,
                            const unsigned char *name2)
 {
@@ -649,10 +647,6 @@ static int udf_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
        struct udf_inode_info *dinfo = UDF_I(dir);
        struct udf_inode_info *iinfo;
 
-       err = -EMLINK;
-       if (dir->i_nlink >= UDF_MAX_LINKS)
-               goto out;
-
        err = -EIO;
        inode = udf_new_inode(dir, S_IFDIR | mode, &err);
        if (!inode)
@@ -1032,9 +1026,6 @@ static int udf_link(struct dentry *old_dentry, struct inode *dir,
        struct fileIdentDesc cfi, *fi;
        int err;
 
-       if (inode->i_nlink >= UDF_MAX_LINKS)
-               return -EMLINK;
-
        fi = udf_add_entry(dir, dentry, &fibh, &cfi, &err);
        if (!fi) {
                return err;
@@ -1126,10 +1117,6 @@ static int udf_rename(struct inode *old_dir, struct dentry *old_dentry,
                if (udf_get_lb_pblock(old_inode->i_sb, &tloc, 0) !=
                                old_dir->i_ino)
                        goto end_rename;
-
-               retval = -EMLINK;
-               if (!new_inode && new_dir->i_nlink >= UDF_MAX_LINKS)
-                       goto end_rename;
        }
        if (!nfi) {
                nfi = udf_add_entry(new_dir, new_dentry, &nfibh, &ncfi,

diff --git a/fs/udf/super.c b/fs/udf/super.c
index c09a84d..8d8b253 100644 (file)
--- a/fs/udf/super.c
+++ b/fs/udf/super.c
@@ -75,6 +75,8 @@
 
 #define UDF_DEFAULT_BLOCKSIZE 2048
 
+enum { UDF_MAX_LINKS = 0xffff };
+
 /* These are the "meat" - everything else is stuffing */
 static int udf_fill_super(struct super_block *, void *, int);
 static void udf_put_super(struct super_block *);
@@ -2042,6 +2044,7 @@ static int udf_fill_super(struct super_block *sb, void *options, int silent)
                goto error_out;
        }
        sb->s_maxbytes = MAX_LFS_FILESIZE;
+       sb->s_max_links = UDF_MAX_LINKS;
        return 0;
 
 error_out:

diff --git a/fs/ufs/namei.c b/fs/ufs/namei.c
index 38cac19..a2281ca 100644 (file)
--- a/fs/ufs/namei.c
+++ b/fs/ufs/namei.c
@@ -166,10 +166,6 @@ static int ufs_link (struct dentry * old_dentry, struct inode * dir,
        int error;
 
        lock_ufs(dir->i_sb);
-       if (inode->i_nlink >= UFS_LINK_MAX) {
-               unlock_ufs(dir->i_sb);
-               return -EMLINK;
-       }
 
        inode->i_ctime = CURRENT_TIME_SEC;
        inode_inc_link_count(inode);
@@ -183,10 +179,7 @@ static int ufs_link (struct dentry * old_dentry, struct inode * dir,
 static int ufs_mkdir(struct inode * dir, struct dentry * dentry, umode_t mode)
 {
        struct inode * inode;
-       int err = -EMLINK;
-
-       if (dir->i_nlink >= UFS_LINK_MAX)
-               goto out;
+       int err;
 
        lock_ufs(dir->i_sb);
        inode_inc_link_count(dir);
@@ -305,11 +298,6 @@ static int ufs_rename(struct inode *old_dir, struct dentry *old_dentry,
                        drop_nlink(new_inode);
                inode_dec_link_count(new_inode);
        } else {
-               if (dir_de) {
-                       err = -EMLINK;
-                       if (new_dir->i_nlink >= UFS_LINK_MAX)
-                               goto out_dir;
-               }
                err = ufs_add_link(new_dentry, old_inode);
                if (err)
                        goto out_dir;

diff --git a/fs/ufs/super.c b/fs/ufs/super.c
index 5246ee3..ec25d09 100644 (file)
--- a/fs/ufs/super.c
+++ b/fs/ufs/super.c
@@ -1157,6 +1157,7 @@ magic_found:
                            "fast symlink size (%u)\n", uspi->s_maxsymlinklen);
                uspi->s_maxsymlinklen = maxsymlen;
        }
+       sb->s_max_links = UFS_LINK_MAX;
 
        inode = ufs_iget(sb, UFS_ROOTINO);
        if (IS_ERR(inode)) {

diff --git a/fs/xfs/xfs_rename.c b/fs/xfs/xfs_rename.c
index 866de27..e44ef7e 100644 (file)
--- a/fs/xfs/xfs_rename.c
+++ b/fs/xfs/xfs_rename.c
@@ -118,17 +118,6 @@ xfs_rename(
        new_parent = (src_dp != target_dp);
        src_is_directory = S_ISDIR(src_ip->i_d.di_mode);
 
-       if (src_is_directory) {
-               /*
-                * Check for link count overflow on target_dp
-                */
-               if (target_ip == NULL && new_parent &&
-                   target_dp->i_d.di_nlink >= XFS_MAXLINK) {
-                       error = XFS_ERROR(EMLINK);
-                       goto std_return;
-               }
-       }
-
        xfs_sort_for_rename(src_dp, target_dp, src_ip, target_ip,
                                inodes, &num_inodes);
 

diff --git a/fs/xfs/xfs_super.c b/fs/xfs/xfs_super.c
index ee5b695..0e4c5c0 100644 (file)
--- a/fs/xfs/xfs_super.c
+++ b/fs/xfs/xfs_super.c
@@ -1341,6 +1341,7 @@ xfs_fs_fill_super(
        sb->s_blocksize = mp->m_sb.sb_blocksize;
        sb->s_blocksize_bits = ffs(sb->s_blocksize) - 1;
        sb->s_maxbytes = xfs_max_file_offset(sb->s_blocksize_bits);
+       sb->s_max_links = XFS_MAXLINK;
        sb->s_time_gran = 1;
        set_posix_acl_flag(sb);
 

diff --git a/fs/xfs/xfs_utils.c b/fs/xfs/xfs_utils.c
index 89dbb4a..79c05ac 100644 (file)
--- a/fs/xfs/xfs_utils.c
+++ b/fs/xfs/xfs_utils.c
@@ -296,8 +296,6 @@ xfs_bumplink(
        xfs_trans_t *tp,
        xfs_inode_t *ip)
 {
-       if (ip->i_d.di_nlink >= XFS_MAXLINK)
-               return XFS_ERROR(EMLINK);
        xfs_trans_ichgtime(tp, ip, XFS_ICHGTIME_CHG);
 
        ASSERT(ip->i_d.di_nlink > 0);

diff --git a/fs/xfs/xfs_vnodeops.c b/fs/xfs/xfs_vnodeops.c
index ebdb888..64981d7 100644 (file)
--- a/fs/xfs/xfs_vnodeops.c
+++ b/fs/xfs/xfs_vnodeops.c
@@ -917,14 +917,6 @@ xfs_create(
        xfs_ilock(dp, XFS_ILOCK_EXCL | XFS_ILOCK_PARENT);
        unlock_dp_on_error = B_TRUE;
 
-       /*
-        * Check for directory link count overflow.
-        */
-       if (is_dir && dp->i_d.di_nlink >= XFS_MAXLINK) {
-               error = XFS_ERROR(EMLINK);
-               goto out_trans_cancel;
-       }
-
        xfs_bmap_init(&free_list, &first_block);
 
        /*
@@ -1429,14 +1421,6 @@ xfs_link(
        xfs_trans_ijoin(tp, tdp, XFS_ILOCK_EXCL);
 
        /*
-        * If the source has too many links, we can't make any more to it.
-        */
-       if (sip->i_d.di_nlink >= XFS_MAXLINK) {
-               error = XFS_ERROR(EMLINK);
-               goto error_return;
-       }
-
-       /*
         * If we are using project inheritance, we only allow hard link
         * creation in our tree when the project IDs are the same; else
         * the tree quota mechanism could be circumvented.

diff --git a/include/linux/fs.h b/include/linux/fs.h
index 69cd5bb..0ab8942 100644 (file)
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -1459,6 +1459,7 @@ struct super_block {
        u8 s_uuid[16];                          /* UUID */
 
        void                    *s_fs_info;     /* Filesystem private info */
+       unsigned int            s_max_links;
        fmode_t                 s_mode;
 
        /* Granularity of c/m/atime in ns.