diff options
Diffstat (limited to 'Documentation/filesystems')
| -rw-r--r-- | Documentation/filesystems/f2fs.rst | 13 | ||||
| -rw-r--r-- | Documentation/filesystems/overlayfs.rst | 2 |
2 files changed, 8 insertions, 7 deletions
diff --git a/Documentation/filesystems/f2fs.rst b/Documentation/filesystems/f2fs.rst index ad8dc8c040a2..98dc24f5c6f0 100644 --- a/Documentation/filesystems/f2fs.rst +++ b/Documentation/filesystems/f2fs.rst @@ -818,10 +818,11 @@ Compression implementation Instead, the main goal is to reduce data writes to flash disk as much as possible, resulting in extending disk life time as well as relaxing IO congestion. Alternatively, we've added ioctl(F2FS_IOC_RELEASE_COMPRESS_BLOCKS) - interface to reclaim compressed space and show it to user after putting the - immutable bit. Immutable bit, after release, it doesn't allow writing/mmaping - on the file, until reserving compressed space via - ioctl(F2FS_IOC_RESERVE_COMPRESS_BLOCKS) or truncating filesize to zero. + interface to reclaim compressed space and show it to user after setting a + special flag to the inode. Once the compressed space is released, the flag + will block writing data to the file until either the compressed space is + reserved via ioctl(F2FS_IOC_RESERVE_COMPRESS_BLOCKS) or the file size is + truncated to zero. Compress metadata layout:: @@ -830,12 +831,12 @@ Compress metadata layout:: | cluster 1 | cluster 2 | ......... | cluster N | +-----------------------------------------------+ . . . . - . . . . + . . . . . Compressed Cluster . . Normal Cluster . +----------+---------+---------+---------+ +---------+---------+---------+---------+ |compr flag| block 1 | block 2 | block 3 | | block 1 | block 2 | block 3 | block 4 | +----------+---------+---------+---------+ +---------+---------+---------+---------+ - . . + . . . . . . +-------------+-------------+----------+----------------------------+ diff --git a/Documentation/filesystems/overlayfs.rst b/Documentation/filesystems/overlayfs.rst index 7da6c30ed596..4c76fda07645 100644 --- a/Documentation/filesystems/overlayfs.rst +++ b/Documentation/filesystems/overlayfs.rst @@ -607,7 +607,7 @@ can be removed. User xattr ---------- -The the "-o userxattr" mount option forces overlayfs to use the +The "-o userxattr" mount option forces overlayfs to use the "user.overlay." xattr namespace instead of "trusted.overlay.". This is useful for unprivileged mounting of overlayfs. |