diff options
| author | Theodore Ts'o <tytso@mit.edu> | 2019-08-11 16:32:41 -0400 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2019-08-11 16:32:41 -0400 |
| commit | bb5835edcdf8bf78bbe51cff13e332c439bc0567 (patch) | |
| tree | 74e9498c0cb0f42a3158d0a892181316e5a8a243 /fs/ext4/ext4.h | |
| parent | 1ad3ea6e0a694b0486eb2cbe60378ad0fbf23642 (diff) | |
| download | lwn-bb5835edcdf8bf78bbe51cff13e332c439bc0567.tar.gz lwn-bb5835edcdf8bf78bbe51cff13e332c439bc0567.zip | |
ext4: add new ioctl EXT4_IOC_GET_ES_CACHE
For debugging reasons, it's useful to know the contents of the extent
cache. Since the extent cache contains much of what is in the fiemap
ioctl, use an fiemap-style interface to return this information.
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Diffstat (limited to 'fs/ext4/ext4.h')
| -rw-r--r-- | fs/ext4/ext4.h | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h index ee296797bcd2..e2d8ad27f4d1 100644 --- a/fs/ext4/ext4.h +++ b/fs/ext4/ext4.h @@ -652,6 +652,7 @@ enum { /* ioctl codes 19--39 are reserved for fscrypt */ #define EXT4_IOC_CLEAR_ES_CACHE _IO('f', 40) #define EXT4_IOC_GETSTATE _IOW('f', 41, __u32) +#define EXT4_IOC_GET_ES_CACHE _IOWR('f', 42, struct fiemap) #define EXT4_IOC_FSGETXATTR FS_IOC_FSGETXATTR #define EXT4_IOC_FSSETXATTR FS_IOC_FSSETXATTR @@ -692,6 +693,12 @@ enum { #define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION #endif +/* + * Returned by EXT4_IOC_GET_ES_CACHE as an additional possible flag. + * It indicates that the entry in extent status cache is for a hole. + */ +#define EXT4_FIEMAP_EXTENT_HOLE 0x08000000 + /* Max physical block we can address w/o extents */ #define EXT4_MAX_BLOCK_FILE_PHYS 0xFFFFFFFF @@ -3258,6 +3265,9 @@ extern int ext4_ext_check_inode(struct inode *inode); extern ext4_lblk_t ext4_ext_next_allocated_block(struct ext4_ext_path *path); extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, __u64 start, __u64 len); +extern int ext4_get_es_cache(struct inode *inode, + struct fiemap_extent_info *fieinfo, + __u64 start, __u64 len); extern int ext4_ext_precache(struct inode *inode); extern int ext4_collapse_range(struct inode *inode, loff_t offset, loff_t len); extern int ext4_insert_range(struct inode *inode, loff_t offset, loff_t len); |