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This is the 12/12 step of rebuilding. Since all meta areas are ready,
master node can be updated. After this step, a consistent UBIFS image
can be mounted, and it should pass all tests from chk_fs, chk_general,
chk_index, chk_lprops and chk_orphans.
Signed-off-by: Zhihao Cheng <chengzhihao1@huawei.com>
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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This is the 11/12 step of rebuilding. Clean up log and orphan area, all
nodes have been recovered, these two areas should be cleared, otherwise
old content in journal/orphan could be replayed in next mounting.
Signed-off-by: Zhihao Cheng <chengzhihao1@huawei.com>
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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This is the 10/12 step of rebuilding. All LEBs' properties can be
calculated in previous steps according to all nodes' position, then
construct LPT just like mkfs does, and write LPT on flash.
Signed-off-by: Zhihao Cheng <chengzhihao1@huawei.com>
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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This is the 9/12 step of repairing. Construct TNC according to scanned
files, and write TNC on flash, just like mkfs does.
Building TNC can effectively solve many failed mounting problems caused
by bad TNC (eg. bad node pointed by TNC, bad key order in znode, etc.).
Signed-off-by: Zhihao Cheng <chengzhihao1@huawei.com>
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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This is a preparation for building TNC, there must at least one file
in filesystem, if not, just create new root dir.
Signed-off-by: Zhihao Cheng <chengzhihao1@huawei.com>
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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This is the 8/12 step of rebuilding. Re-write data. Read data from
LEB and write back data, make sure that all LEB is ended with empty
data(0xFF). It will prevent failed gc scanning in next mounting.
Signed-off-by: Zhihao Cheng <chengzhihao1@huawei.com>
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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This is the 7/12 step of rebuilding. Record used LEBs which may hold
useful nodes, then left unused LEBs could be taken for storing new index
tree. Notice, LEB that contains effective nodes on deleted trees in step
1 is regarded as used.
Signed-off-by: Zhihao Cheng <chengzhihao1@huawei.com>
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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This is the 6/12 step of rebuilding. Correct the file information.
Traverse all files and calculate information (nlink, size, xattr_cnt,
etc.) for each file just like check_leaf() does, correct inode node
based on the calculated information.
Now, all files are consistent, and UBIFS will pass chk_fs after mounting.
Signed-off-by: Zhihao Cheng <chengzhihao1@huawei.com>
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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This is the 5/12 step of rebuilding. Extract reachable directory entries
tree. Make sure that all files can be searched from '/', unreachable
file is deleted. So, all files can be accessible in userspace after
reparing.
Signed-off-by: Zhihao Cheng <chengzhihao1@huawei.com>
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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This is the 4/12 step of rebuilding. Filter out invalid files and drop
them, for example:
1. File has no inode node or inode nlink is zero
2. Nonconsistent file type between inode node and dentry nodes
3. File has no dentry nodes(excepts '/')
4. Encrypted file has no xattr information
5. Non regular file has data nodes
6. Directory/xattr file has more than one dentries
7. Xattr file has no host inode, or the host inode is a xattr
...
Valid xattr file will be inserted into corresponding host file's subtree.
Signed-off-by: Zhihao Cheng <chengzhihao1@huawei.com>
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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This is the 3/12 step of rebuilding. Generate file according to left valid
inode nodes and dentry nodes. Based on the results from step 2, it is easy
to understand:
Step 2 has done:
valid_inos - del_inos = left_inos
valid_dents - del_dents = left_dents
Step 3 should do:
Traverse left_inos and left_dents, insert inode/dentry nodes into
corresponding file.
After that, all files are generated by scanning, the next thing to do is
dropping invalid files(eg. nonconsistent file type between inode node and
dentry nodes, file has no dentry nodes(excepts '/'), encrypted file has
no xattr information, etc.), which will be done in next step.
Signed-off-by: Zhihao Cheng <chengzhihao1@huawei.com>
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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This is the 2/12 step of rebuilding. Traverse nodes from del_inos and
del_dents trees, remove inode nodes and dentry nodes with smaller sqnum
from valid trees.
This step handles deleting case, for example, file A is deleted, deleted
inode node and deleted dentry node are written, if we ignore the deleted
nodes, file A can be recovered after rebuilding because undeleted inode
node and undeleted dentry node can be scanned. There's an exception, if
deleted inode node and deleted dentry node are reclaimed(by gc) after
deletion, file A is recovered. UBIFS rebuild_fs cannot solve it, because
the real existence information of nodes depends on TNC, but TNC should
not be depended for UBIFS rebuild_fs.
Signed-off-by: Zhihao Cheng <chengzhihao1@huawei.com>
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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Add rebuilding filesystem support. This is the 1/12 step of rebuilding.
Collect files, valid inode nodes, deleted inode nodes, valid dentry
nodes and deleted dentry nodes in kinds of trees by scanning nodes from
flash. Corrupted nodes(eg. incorrect crc, bad inode size, bad dentry
name length, etc.) are dropped during scanning. Larger sqnum node is
picked when more than 1 nodes with same index.
In this step, trun node and data nodes are put into corresponding file,
inode/dentry nodes are put into four trees: valid_inos(nlink != 0),
del_inos(nlink is 0), valid_dents(inum != 0), del_dents(inum is 0).
Next step will process above four trees to deal deletion situations.
Signed-off-by: Zhihao Cheng <chengzhihao1@huawei.com>
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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In order to check the consistency of each file and the reachability of
the whole dentry tree, fsck orginizes all nodes into files. And the
final recovered file(xattr is treated as a file) is organized as:
(rbtree, inum indexed)
/ \
file1 file2
/ \
file3 file4
file {
inode node // each file has 1 inode node
dentry (sub rb_tree, sqnum indexed) // '/' has no dentries,
// otherwise at least 1
// dentry is required.
trun node // the newest one truncation node
data (sub rb_tree, block number indexed) // Each file may have 0
// or many data nodes
xattrs (sub rb_tree, inum indexed) // Each file may have 0 or
// many xattr files
}
Each file from file rb_tree is constructed by scanning nodes(eg. inode,
dentry, etc.) from the TNC or the UBI volume. File's xattrs will be
initialized in subsequent steps.
Signed-off-by: Zhihao Cheng <chengzhihao1@huawei.com>
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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Add parsing functions for each type of nodes, which will be used for
checking the validity of raw node data while reading from TNC or
scanning from UBIFS logical erase block.
Signed-off-by: Zhihao Cheng <chengzhihao1@huawei.com>
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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Load filesystem information from UBI volume (Similar to UBIFS mounting
process), initialize kinds of buffers and read superblock. This is the
base step for both fsck and rebuild_fs. Subsequent pacthes will complete
this step by adding more steps(eg. read master, replay journal, etc.)
which are only used in fsck.
Signed-off-by: Zhihao Cheng <chengzhihao1@huawei.com>
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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Read failure caused by scanning corrupted data or invalid data members
should be identified, because fsck can handle it. Updating lp failure
caused by bad space statistics should be identified too, because fsck
can handle it.
Add eight callback functions to implement it for fsck:
1. set_failure_reason_callback: Record failure reasons when reading or
parsing node failed, there are four reasons:
a. FR_DATA_CORRUPTED: scanning corrupted data or invalid nodes found
b. FR_TNC_CORRUPTED: invalid index nodes
c. FR_LPT_CORRUPTED: invalid pnode/nnode
d. FR_LPT_INCORRECT: invalid space statistics or invalid LEB properties
2. get_failure_reason_callback: get failure reasons
3. clear_failure_reason_callback: Clear the error which is caused by
above reasons.
4. test_and_clear_failure_reason_callback: Check and clear the error
which is caused by above reasons, if so, fsck will handle it
according to specific situation.
For example, fsck will drop data node rather than fails to return
when reading failure is caused by DATA_CORRUPTED.
For another example, journal replaying will continue rather than
fails to return if updating lpt failure is caused by LPT_CORRUPTED.
5. set_lpt_invalid_callback: Set the invalid lpt status
6. test_lpt_valid_callback: Check whether the lpt is corrupted/incorrect,
it should be invoked before updating lp, if lpt status is invalid,
returns false (which means that caller should skip updating lp, because
updating lp could trigger assertion failed in ubifs_change_lp).
7. can_ignore_failure_callback: Check whether the failure can be
ignored, some inconsistent errors won't affect the fsck process,
for example wrong space statistics can be fixed after traversing
TNC, so failures caused by incorrect space statistics can be ignored.
8. handle_failure_callback: Check whether the failure can be handled,
some inconsistent errors could be fixed by fsck, we have fix_problem
to do that, but UBIFS needs a callback function to invoke it in common
libs.
Signed-off-by: Zhihao Cheng <chengzhihao1@huawei.com>
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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There are four dimensions to define the type of inconsistent problems:
1. fixable: Some inconsistent problems can't be fixed, for example
corrupted superblock. Un-fixable problem will abort program.
2. must fix: Some inconsistent problems can be ignored(eg. incorrect
isize), but some are not(eg. corrupted TNC), which will affect the
subsequent fsck steps.
3. drop data: Some fixing methods will drop user data, which is
unacceptable for safe mode. If it happens, fsck will be aborted.
4. need rebuild: Some inconsistent problems depends on rebuilding
filesystem to be fixed(eg. corrupted master node, corrupted TNC).
Define an asking function to handle above kinds of inconsistent problems.
Signed-off-by: Zhihao Cheng <chengzhihao1@huawei.com>
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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Add basic process code for fsck.ubifs. There are following modes for fsck:
1. normal mode: Check the filesystem, ask user whether or not to fix
the problem as long as inconsistent data is found during fs checking.
2. safe mode: Check and safely repair the filesystem, if there are any
data dropping operations needed by fixing, fsck will fail.
3. danger mode: Answer 'yes' to all questions. There two sub modes:
a) Check and repair the filesystem according to TNC, data dropping
will be reported. If TNC/master/log is corrupted, fsck will fail.
b) Check and forcedly repair the filesystem according to TNC, turns
to rebuild filesystem if TNC/master/log is corrupted. Always make
fsck succeed.
4. check mode: Make no changes to the filesystem, only check the
filesystem.
5. rebuild mode: Scan entire UBI volume to find all nodes, and rebuild
filesystem, always make fsck success.
Signed-off-by: Zhihao Cheng <chengzhihao1@huawei.com>
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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Set errno if the target is not char device. It will be useful for
fsck to print error message if open_ubi failed.
Signed-off-by: Zhihao Cheng <chengzhihao1@huawei.com>
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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Replace ubifs related source code with the implementation of linux kernel.
It makes userspace implementation be same with linux kernel, then
fsck.ubifs can resuse the code.
Signed-off-by: Zhihao Cheng <chengzhihao1@huawei.com>
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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There are many linux kernel source files have been adapted into
ubifs-utils, add descriptions for these source files in README.
Signed-off-by: Zhihao Cheng <chengzhihao1@huawei.com>
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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Since ubifs-media.h is only used for ubifs-utils, move it under
ubifs-utils/libubifs.
Signed-off-by: Zhihao Cheng <chengzhihao1@huawei.com>
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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Adapt gc subsystem(find.c, gc.c, scan.c) in libubifs, compared with
linux kernel implementations:
1. Adapt print_hex_dump based on implementations in hexdump.c.
Signed-off-by: Zhihao Cheng <chengzhihao1@huawei.com>
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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Adapt orphan.c in libubifs, compared with linux kernel implementations:
1. Keep the commit related implementations, because do_commit depends
on these functions which will be invoked in fsck.
2. Keep the orphan replaying implementations, because fsck needs them.
3. Other implementations are removed which won't be used in mkfs/fsck.
Signed-off-by: Zhihao Cheng <chengzhihao1@huawei.com>
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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Adapt misc.h in libubifs, compared with linux kernel implementations:
1. Remove some functions(eg. ubifs_compr_name, ubifs_wake_up_bgt) which
won't be used in fsck/mkfs.
Signed-off-by: Zhihao Cheng <chengzhihao1@huawei.com>
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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Adapt master.c in libubifs, compared with linux kernel implementations:
1. Remove authentication related implementations
(eg. mst_node_check_hash), authentication is not supported in fsck
for now.
Signed-off-by: Zhihao Cheng <chengzhihao1@huawei.com>
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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Adapt key.h in libubifs, compared with linux kernel implementations:
1. Add '__unused' modifier for unused parameters to avoid compiling
warnings.
2. Remove some functions(eg. lowest_dent_key, dent_key_init_flash)
which won't be used in fsck/mkfs.
Signed-off-by: Zhihao Cheng <chengzhihao1@huawei.com>
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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Adapt debug subsystem(debug.c, debug.h) in libubifs, compared with
linux kernel implementations:
1. Only keep the disk data and space statistics dumping implementations,
dbg_walk_index and add_size which are used by fsck, other debuging
related implementations and sysfs interfaces are removed, because
fsck will check fs in another way.
2. Change the behavior of ubifs_assert_failed(), make filesystem
readonly when assertion is failed.
Signed-off-by: Zhihao Cheng <chengzhihao1@huawei.com>
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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Adapt commit.c in libubifs, compared with linux kernel implementations:
1. Remove debug related implementations(eg. dbg_check_old_index), debug
functions are not needed by fsck, because fsck will check fs in
another way.
2. Remove ubifs background committing related implementations, there
will be no background ubifs threads in fsck.
Signed-off-by: Zhihao Cheng <chengzhihao1@huawei.com>
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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Adapt budget.c in libubifs, compared with linux kernel implementations:
1. Remove writeback related functions, there are no dirty pages/inodes
for UBIFS in userspace process.
Signed-off-by: Zhihao Cheng <chengzhihao1@huawei.com>
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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Adapt journal.c in libubifs, compared with linux kernel implementations:
1. Remove all ubifs_jnl_XXX functions. Only keep the basic space
reservation code, fsck will add new functions for journaling
operations without using linux in-memory inode/dentry.
Signed-off-by: Zhihao Cheng <chengzhihao1@huawei.com>
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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Adapt dir.c in libubifs, compared with linux kernel implementations:
1. Remove all functions. Only keep an empty source file, fsck will
add new functions for mkdir/link operations without using linux
in-memory inode/dentry.
Signed-off-by: Zhihao Cheng <chengzhihao1@huawei.com>
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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Adapt auth.c in libubifs, compared with linux kernel implementations:
1. Only keep implementations used by mkfs, other implementations
are removed.
2. Adapt functions based on implementations in common/sign.c.
Signed-off-by: Zhihao Cheng <chengzhihao1@huawei.com>
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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Adapt sb.c in libubifs, compared with linux kernel implementations:
1. Remove authentication related implementations
(eg. authenticate_sb_node), authentication is not supported in fsck
for now.
2. Remove some functions(eg. create_default_filesystem) which won't be
used in fsck/mkfs.
3. Modify ubifs_read_superblock(), remove some assignments which won't
be used in mkfs/fsck.
4. Apapt fixup_leb to ignore %-EBADMSG, subsequent steps will check
all areas carefully.
Signed-off-by: Zhihao Cheng <chengzhihao1@huawei.com>
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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Adapt recovery subsystem(replay.c, recovery.c) in libubifs, compared with
linux kernel implementations:
1. Remove authentication related implementations
(eg. authenticate_sleb_hash), authentication is not supported in fsck
for now.
2. Add explicit type conversions(const char *) to avoid compiling
warnings.
3. Replace implementations of inode_fix_size() with ubifs_assert(0),
authentication is not supported in fsck, so this function won't
be invoked.
4. Remove unused ubifs_clean_lebs() and ubifs_write_rcvrd_mst_node().
5. Adapt fix_unclean_leb/recover_head/fix_size_in_place to ignore
%-EBADMSG, subsequent steps will check nodes in lpt/main area
carefully.
Signed-off-by: Zhihao Cheng <chengzhihao1@huawei.com>
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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Adapt log.c in libubifs, compared with linux kernel implementations:
1. Remove debug related implementations(eg. dbg_check_bud_bytes), debug
functions are not needed by fsck, because fsck will check fs in
another way.
Signed-off-by: Zhihao Cheng <chengzhihao1@huawei.com>
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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Adapt tnc subsystem(tnc.c,tnc_misc.c,tnc_commit.c) in libubifs, compared
with linux kernel implementations:
1. Remove debug related functions(eg. dbg_check_inode_size), debug
functions are not needed by fsck, because fsck will check fs in
another way.
2. Remove some functions(eg. ubifs_tnc_bulk_read) which won't be used
in fsck/mkfs.
3. Adapt tnc_delete and ubifs_search_zbranch to handle empty TNC case,
which could happen in fsck.
4. Don't skip checking the length of non-leaf index node's branch in
read_znode.
5. Adapt try_read_node to ignore %-EBADMSG, subsequent steps will check
nodes carefully.
Signed-off-by: Zhihao Cheng <chengzhihao1@huawei.com>
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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Adapt lpt subsystem(lpt.c,lprops.c,lpt_commit.c) in libubifs, compared
with linux kernel implementations:
1. Remove debug related functions(eg. dbg_chk_lpt_sz, dbg_chk_pnode),
some of debug functions are not needed by fsck, because fsck will
check fs in another way.
2. Remove some functions(eg. ubifs_create_dflt_lpt) which won't be used
in fsck/mkfs.
3. Adapt do_calc_lpt_geom() to mkfs/fsck situations.
4. Adapt calc_dflt_lpt_geom to support the mkfs tool, and export it.
5. Adapt ubifs_create_lpt() according to create_lpt(mkfs), make sure that
the height of created lpt is right.
Signed-off-by: Zhihao Cheng <chengzhihao1@huawei.com>
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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Adapt io.c in libubifs, compared with linux kernel implementations:
1. Modify io related functions(eg. ubifs_leb_read/ubifs_leb_write,
etc.), adapt them with userspace io functions lseek/read/write.
2. Remove some functions(eg. record_magic_error, ubifs_bg_wbufs_sync)
which won't be used in fsck/mkfs.
3. Replce ubifs_errc with ubifs_err, because there will be no SB_SILENT
options in mkfs/fsck.
4. Initiate wbuf->size as c->max_write_size.
Signed-off-by: Zhihao Cheng <chengzhihao1@huawei.com>
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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Adapt super.c in libubifs, compared with linux kernel implementations:
1. It contains all definitions in common/super.c(Message printing
functions are replaced with linux kernel styles).
2. Remove some functions(eg. ubifs_iget, ubifs_dirty_inode) which won't
be used in fsck/mkfs.
3. Remove unused variables initialization in some functions(eg.
init_constants_early, init_constants_sb).
Signed-off-by: Zhihao Cheng <chengzhihao1@huawei.com>
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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Adapt ubifs header file in libubifs, compared with linux kernel
implementations:
1. New header file contains all definitions in common/ubifs.h
2. Remove some structures(eg. ubifs_mount_opts, bu_info) and
functions(eg. ubifs_sync_wbufs_by_inode, ubifs_jnl_XXX) which
won't be used in fsck/mkfs.
3. Modify some authentication related functions, keep functions
that mkfs may need, other functions are defined as empty.
4. Move ubifs message printing functions(ubifs_err/warn/msg) which
are originally defined in misc.c into ubifs.h.
Signed-off-by: Zhihao Cheng <chengzhihao1@huawei.com>
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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There are several new libs(eg. atomic, kmem, bitops. etc.) have
been imported into ubifs-utils, add descriptions for these libs
in README.
Signed-off-by: Zhihao Cheng <chengzhihao1@huawei.com>
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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Add common definitions in linux kernel, which are used in UBIFS linux
kernel libs.
This is a preparation for replacing implementation of UBIFS utils with
linux kernel libs.
Signed-off-by: Zhihao Cheng <chengzhihao1@huawei.com>
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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Add ubi_leb_map() implementation, it is used in UBIFS linux kernel libs.
This is a preparation for replacing implementation of UBIFS utils with
linux kernel libs.
Signed-off-by: Zhihao Cheng <chengzhihao1@huawei.com>
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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Add linux hexdump implementations lib, because function print_hex_dump()
is used in UBIFS linux kernel libs.
This is a preparation for replacing implementation of UBIFS utils with
linux kernel libs.
Signed-off-by: Zhihao Cheng <chengzhihao1@huawei.com>
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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Add implementations for linux kernel printing functions, because these
functions(eg. pr_debug, pr_err, etc.) are widely used in UBIFS linux
kernel libs. No need to define multiple levels in dbg_msg for debuging,
just replace dbg_msg with pr_debug. Now, there are five levels of
printing messages:
0 - none
1 - error message
2 - warning message [default]
3 - notice message
4 - debug message
This is a preparation for replacing implementation of UBIFS utils with
linux kernel libs.
Signed-off-by: Zhihao Cheng <chengzhihao1@huawei.com>
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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Add sorting implementations, because the sorting function
is used in UBIFS linux kernel libs.
This is a preparation for replacing implementation of UBIFS utils with
linux kernel libs.
Signed-off-by: Zhihao Cheng <chengzhihao1@huawei.com>
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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Add rwsem implementations, because there are some rwsems
(eg. c->commit_sem) used in UBIFS linux kernel libs.
The rwsem is implemented based on pthread mutex.
This is a preparation for replacing implementation of UBIFS utils with
linux kernel libs.
Signed-off-by: Zhihao Cheng <chengzhihao1@huawei.com>
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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Add mutexlock implementations, because there are some mutexlocks
(eg. c->tnc_mutex, c->log_mutex) used in UBIFS linux kernel libs.
The mutexlock is implemented based on pthread mutex.
This is a preparation for replacing implementation of UBIFS utils with
linux kernel libs.
Signed-off-by: Zhihao Cheng <chengzhihao1@huawei.com>
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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