f2fs: introduce FI_COMPRESS_RELEASED instead of using IMMUTABLE bit

Once we release compressed blocks, we used to set IMMUTABLE bit. But it turned
out it disallows every fs operations which we don't need for compression.

Let's just prevent writing data only.

Reviewed-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

diff --git a/fs/f2fs/compress.c b/fs/f2fs/compress.c
index bec92ff..1c3e980 100644 (file)
--- a/fs/f2fs/compress.c
+++ b/fs/f2fs/compress.c
@@ -928,7 +928,8 @@ static int __f2fs_cluster_blocks(struct inode *inode,
                }
 
                f2fs_bug_on(F2FS_I_SB(inode),
-                       !compr && ret != cluster_size && !IS_IMMUTABLE(inode));
+                       !compr && ret != cluster_size &&
+                       !is_inode_flag_set(inode, FI_COMPRESS_RELEASED));
        }
 fail:
        f2fs_put_dnode(&dn);

diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index c0bead0..eaf57b5 100644 (file)
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -706,6 +706,7 @@ enum {
        FI_COMPRESS_CORRUPT,    /* indicate compressed cluster is corrupted */
        FI_MMAP_FILE,           /* indicate file was mmapped */
        FI_ENABLE_COMPRESS,     /* enable compression in "user" compression mode */
+       FI_COMPRESS_RELEASED,   /* compressed blocks were released */
        FI_MAX,                 /* max flag, never be used */
 };
 
@@ -2746,6 +2747,7 @@ static inline void __mark_inode_dirty_flag(struct inode *inode,
        case FI_DATA_EXIST:
        case FI_INLINE_DOTS:
        case FI_PIN_FILE:
+       case FI_COMPRESS_RELEASED:
                f2fs_mark_inode_dirty_sync(inode, true);
        }
 }
@@ -2867,6 +2869,8 @@ static inline void get_inline_info(struct inode *inode, struct f2fs_inode *ri)
                set_bit(FI_EXTRA_ATTR, fi->flags);
        if (ri->i_inline & F2FS_PIN_FILE)
                set_bit(FI_PIN_FILE, fi->flags);
+       if (ri->i_inline & F2FS_COMPRESS_RELEASED)
+               set_bit(FI_COMPRESS_RELEASED, fi->flags);
 }
 
 static inline void set_raw_inline(struct inode *inode, struct f2fs_inode *ri)
@@ -2887,6 +2891,8 @@ static inline void set_raw_inline(struct inode *inode, struct f2fs_inode *ri)
                ri->i_inline |= F2FS_EXTRA_ATTR;
        if (is_inode_flag_set(inode, FI_PIN_FILE))
                ri->i_inline |= F2FS_PIN_FILE;
+       if (is_inode_flag_set(inode, FI_COMPRESS_RELEASED))
+               ri->i_inline |= F2FS_COMPRESS_RELEASED;
 }
 
 static inline int f2fs_has_extra_attr(struct inode *inode)

diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
index 4a8c312..4714925 100644 (file)
--- a/fs/f2fs/file.c
+++ b/fs/f2fs/file.c
@@ -63,6 +63,9 @@ static vm_fault_t f2fs_vm_page_mkwrite(struct vm_fault *vmf)
        if (unlikely(IS_IMMUTABLE(inode)))
                return VM_FAULT_SIGBUS;
 
+       if (is_inode_flag_set(inode, FI_COMPRESS_RELEASED))
+               return VM_FAULT_SIGBUS;
+
        if (unlikely(f2fs_cp_error(sbi))) {
                err = -EIO;
                goto err;
@@ -3420,7 +3423,7 @@ static int f2fs_release_compress_blocks(struct file *filp, unsigned long arg)
                goto out;
        }
 
-       if (IS_IMMUTABLE(inode)) {
+       if (is_inode_flag_set(inode, FI_COMPRESS_RELEASED)) {
                ret = -EINVAL;
                goto out;
        }
@@ -3429,8 +3432,7 @@ static int f2fs_release_compress_blocks(struct file *filp, unsigned long arg)
        if (ret)
                goto out;
 
-       F2FS_I(inode)->i_flags |= F2FS_IMMUTABLE_FL;
-       f2fs_set_inode_flags(inode);
+       set_inode_flag(inode, FI_COMPRESS_RELEASED);
        inode->i_ctime = current_time(inode);
        f2fs_mark_inode_dirty_sync(inode, true);
 
@@ -3585,7 +3587,7 @@ static int f2fs_reserve_compress_blocks(struct file *filp, unsigned long arg)
 
        inode_lock(inode);
 
-       if (!IS_IMMUTABLE(inode)) {
+       if (!is_inode_flag_set(inode, FI_COMPRESS_RELEASED)) {
                ret = -EINVAL;
                goto unlock_inode;
        }
@@ -3630,8 +3632,7 @@ static int f2fs_reserve_compress_blocks(struct file *filp, unsigned long arg)
        up_write(&F2FS_I(inode)->i_mmap_sem);
 
        if (ret >= 0) {
-               F2FS_I(inode)->i_flags &= ~F2FS_IMMUTABLE_FL;
-               f2fs_set_inode_flags(inode);
+               clear_inode_flag(inode, FI_COMPRESS_RELEASED);
                inode->i_ctime = current_time(inode);
                f2fs_mark_inode_dirty_sync(inode, true);
        }
@@ -4249,6 +4250,11 @@ static ssize_t f2fs_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
                goto unlock;
        }
 
+       if (is_inode_flag_set(inode, FI_COMPRESS_RELEASED)) {
+               ret = -EPERM;
+               goto unlock;
+       }
+
        ret = generic_write_checks(iocb, from);
        if (ret > 0) {
                bool preallocated = false;

diff --git a/include/linux/f2fs_fs.h b/include/linux/f2fs_fs.h
index 5487a80..f93000c 100644 (file)
--- a/include/linux/f2fs_fs.h
+++ b/include/linux/f2fs_fs.h
@@ -229,6 +229,7 @@ struct f2fs_extent {
 #define F2FS_INLINE_DOTS       0x10    /* file having implicit dot dentries */
 #define F2FS_EXTRA_ATTR                0x20    /* file having extra attribute */
 #define F2FS_PIN_FILE          0x40    /* file should not be gced */
+#define F2FS_COMPRESS_RELEASED 0x80    /* file released compressed blocks */
 
 struct f2fs_inode {
        __le16 i_mode;                  /* file mode */