lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
Open Source and information security mailing list archives
| ||
|
Message-Id: <1387242331-29227-3-git-send-email-adilger@dilger.ca> Date: Mon, 16 Dec 2013 18:05:30 -0700 From: Andreas Dilger <adilger@...ger.ca> To: tytso@....edu Cc: linux-ext4@...r.kernel.org, Andreas Dilger <adilger@...ger.ca> Subject: [PATCH 3/4] filefrag: reserve fields and new extent flags Reserve the FIEMAP_EXTENT_DATA_COMPRESSED flag to allow reporting extents with physical length different than logical length. This also sets the FIEMAP_EXTENT_ENCODED flag to indicate that the data cannot be accessed directly. This adds a new fe_phys_length field to struct fiemap_extent which specifies the physical extent length in bytes when DATA_COMPRESSED is set. Linux 3.14 and later kernels will fill out the fe_phys_length field, but in older kernels the contents are undefined (though typically zero). Reserve the FIEMAP_EXTENT_NET flag, which indicates that the data is on a network filesystem. This also sets FIEMAP_EXTENT_ENCODED flag to indicate the data cannot be accessed directly. Print out these flags in filefrag if detected. Signed-off-by: Andreas Dilger <adilger@...ger.ca> --- lib/ext2fs/fiemap.h | 14 ++++++++++---- misc/filefrag.c | 2 ++ 2 files changed, 12 insertions(+), 4 deletions(-) diff --git a/lib/ext2fs/fiemap.h b/lib/ext2fs/fiemap.h index 30bf555..df973da 100644 --- a/lib/ext2fs/fiemap.h +++ b/lib/ext2fs/fiemap.h @@ -17,15 +17,17 @@ struct fiemap_extent { __u64 fe_physical; /* physical offset in bytes for the start * of the extent from the beginning of the disk */ __u64 fe_length; /* length in bytes for this extent */ - __u64 fe_reserved64[2]; + __u64 fe_phys_length; /* physical length in bytes for this extent, + * undefined if DATA_COMPRESSED not set */ + __u64 fe_reserved64; __u32 fe_flags; /* FIEMAP_EXTENT_* flags for this extent */ __u32 fe_reserved[3]; }; struct fiemap { - __u64 fm_start; /* logical offset (inclusive) at + __u64 fm_start; /* logical offset in bytes (inclusive) at * which to start mapping (in) */ - __u64 fm_length; /* logical length of mapping which + __u64 fm_length; /* logical length in bytes of mapping which * userspace wants (in) */ __u32 fm_flags; /* FIEMAP_FLAG_* flags for request (in/out) */ __u32 fm_mapped_extents;/* number of extents that were mapped (out) */ @@ -51,8 +53,10 @@ struct fiemap { * Sets EXTENT_UNKNOWN. */ #define FIEMAP_EXTENT_ENCODED 0x00000008 /* Data can not be read * while fs is unmounted */ +#define FIEMAP_EXTENT_DATA_COMPRESSED 0x00000040 /* Data is compressed by fs. + * Sets EXTENT_ENCODED. */ #define FIEMAP_EXTENT_DATA_ENCRYPTED 0x00000080 /* Data is encrypted by fs. - * Sets EXTENT_NO_BYPASS. */ + * Sets EXTENT_ENCODED. */ #define FIEMAP_EXTENT_NOT_ALIGNED 0x00000100 /* Extent offsets may not be * block aligned. */ #define FIEMAP_EXTENT_DATA_INLINE 0x00000200 /* Data mixed with metadata. @@ -64,5 +68,7 @@ struct fiemap { #define FIEMAP_EXTENT_MERGED 0x00001000 /* File does not natively * support extents. Result * merged for efficiency. */ +#define FIEMAP_EXTENT_NET 0x80000000 /* Data stored remotely. + * Sets EXTENT_ENCODED. */ #endif /* _LINUX_FIEMAP_H */ diff --git a/misc/filefrag.c b/misc/filefrag.c index 6289899..7096abb 100644 --- a/misc/filefrag.c +++ b/misc/filefrag.c @@ -158,12 +158,14 @@ static void print_extent_info(struct fiemap_extent *fm_extent, int cur_ex, print_flag(&flags, FIEMAP_EXTENT_UNKNOWN, buf, "unknown,"); print_flag(&flags, FIEMAP_EXTENT_DELALLOC, buf, "delalloc,"); + print_flag(&flags, FIEMAP_EXTENT_DATA_COMPRESSED, buf, "compressed,"); print_flag(&flags, FIEMAP_EXTENT_DATA_ENCRYPTED, buf, "encrypted,"); print_flag(&flags, FIEMAP_EXTENT_NOT_ALIGNED, buf, "not_aligned,"); print_flag(&flags, FIEMAP_EXTENT_DATA_INLINE, buf, "inline,"); print_flag(&flags, FIEMAP_EXTENT_DATA_TAIL, buf, "tail_packed,"); print_flag(&flags, FIEMAP_EXTENT_UNWRITTEN, buf, "unwritten,"); print_flag(&flags, FIEMAP_EXTENT_MERGED, buf, "merged,"); + print_flag(&flags, FIEMAP_EXTENT_NET, buf, "net,"); print_flag(&flags, FIEMAP_EXTENT_LAST, buf, "last,"); /* Print unknown flags in hex format. Known flags are already printed * above and will have their bit cleared from "flags". */ -- 1.7.3.4 -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Powered by blists - more mailing lists