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| author | Theodore Ts'o <tytso@mit.edu> | 2019-08-11 16:31:41 -0400 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2019-08-11 16:31:41 -0400 |
| commit | 1ad3ea6e0a694b0486eb2cbe60378ad0fbf23642 (patch) | |
| tree | b728b3450505eac1e85fb7898f49769a22a2938d | |
| parent | b0c013e2928d3696ceb6401311dbc1d7fcccd6dd (diff) | |
| download | linux-1ad3ea6e0a694b0486eb2cbe60378ad0fbf23642.tar.bz2 | |
ext4: add a new ioctl EXT4_IOC_GETSTATE
The new ioctl EXT4_IOC_GETSTATE returns some of the dynamic state of
an ext4 inode for debugging purposes.
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
| -rw-r--r-- | fs/ext4/ext4.h | 11 | ||||
| -rw-r--r-- | fs/ext4/ioctl.c | 17 |
2 files changed, 28 insertions, 0 deletions
diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h index b22f24f1d365..ee296797bcd2 100644 --- a/fs/ext4/ext4.h +++ b/fs/ext4/ext4.h @@ -651,6 +651,7 @@ enum { #define EXT4_IOC_GET_ENCRYPTION_POLICY FS_IOC_GET_ENCRYPTION_POLICY /* 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_FSGETXATTR FS_IOC_FSGETXATTR #define EXT4_IOC_FSSETXATTR FS_IOC_FSSETXATTR @@ -664,6 +665,16 @@ enum { #define EXT4_GOING_FLAGS_LOGFLUSH 0x1 /* flush log but not data */ #define EXT4_GOING_FLAGS_NOLOGFLUSH 0x2 /* don't flush log nor data */ +/* + * Flags returned by EXT4_IOC_GETSTATE + * + * We only expose to userspace a subset of the state flags in + * i_state_flags + */ +#define EXT4_STATE_FLAG_EXT_PRECACHED 0x00000001 +#define EXT4_STATE_FLAG_NEW 0x00000002 +#define EXT4_STATE_FLAG_NEWENTRY 0x00000004 +#define EXT4_STATE_FLAG_DA_ALLOC_CLOSE 0x00000008 #if defined(__KERNEL__) && defined(CONFIG_COMPAT) /* diff --git a/fs/ext4/ioctl.c b/fs/ext4/ioctl.c index 15b1047878ab..ffb7bde4900d 100644 --- a/fs/ext4/ioctl.c +++ b/fs/ext4/ioctl.c @@ -1123,6 +1123,22 @@ resizefs_out: return 0; } + case EXT4_IOC_GETSTATE: + { + __u32 state = 0; + + if (ext4_test_inode_state(inode, EXT4_STATE_EXT_PRECACHED)) + state |= EXT4_STATE_FLAG_EXT_PRECACHED; + if (ext4_test_inode_state(inode, EXT4_STATE_NEW)) + state |= EXT4_STATE_FLAG_NEW; + if (ext4_test_inode_state(inode, EXT4_STATE_NEWENTRY)) + state |= EXT4_STATE_FLAG_NEWENTRY; + if (ext4_test_inode_state(inode, EXT4_STATE_DA_ALLOC_CLOSE)) + state |= EXT4_STATE_FLAG_DA_ALLOC_CLOSE; + + return put_user(state, (__u32 __user *) arg); + } + case EXT4_IOC_FSGETXATTR: { struct fsxattr fa; @@ -1242,6 +1258,7 @@ long ext4_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) case EXT4_IOC_SHUTDOWN: case FS_IOC_GETFSMAP: case EXT4_IOC_CLEAR_ES_CACHE: + case EXT4_IOC_GETSTATE: break; default: return -ENOIOCTLCMD; |