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This is the 10/18 step of fsck. Check and handle inconsistent files, the
checking rule is same as rebuild mode which has been implemented in
check_and_correct_files, but the methods of handling are different:
1. Correct the file information for safe mode, danger mode and normal
mode with 'yes' answer, other modes will exit.
Signed-off-by: Xiang Yang <xiangyang3@huawei.com>
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 9/18 step of fsck. Check and handle unreachable files, the
checking rule is same as rebuild mode which has been implemented in
file_is_reachable, but the methods of handling are different:
1. Move unreachable regular file into disconnected list, let subsequent
steps to handle them with lost+found.
2. Delete unreachable non-regular file.
3. Delete unreachable directory entries.
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 8/18 step of fsck. Check and handle invalid files, the
checking rule is same as rebuild mode which has been implemented in
file_is_valid, but the methods of handling are different:
1. Move unattached(file has no dentries) regular file into disconnected
list, let subsequent steps to handle them with lost+found.
2. Make file type be consistent between inode, detries and data nodes by
deleting dentries or data blocks.
3. Delete file for other invalid cases(eg. file has no inode).
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 second part of 6/18 step in fsck. Add an extra checking for
non-check mode while traversing TNC, make sure that all LEBs(contains TNC)
can be scanned successful. There could be following steps and possible
errors:
Step 2. Scan all LEBs(contain TNC), remove TNC branch which points to
corrupted LEB.
a. corrupted node is found by scanning: If current node is index node,
danger mode with rebuild_fs and normal mode with 'yes' answer will
turn to rebuild filesystem, other modes will exit; If current node
is non-index node, danger mode and normal mode with 'yes' answer
will remove all TNC branches which point to the corrupted LEB,
other modes will exit.
b. LEB contains both index and non-index nodes: danger mode with
rebuild_fs and normal mode with 'yes' answer will turn to rebuild
filesystem, other modes will exit.
This is a preparation for space checking, which means that ubifs_scan
will always succeed when check properties for any TNC LEBs. We do this
before checking files(step 7) & extracting dentry tree(step 8), nodes
cannot be dropped(which may corrupted file and make file inconsistent
again) when scanning corrupted as long as the dentry tree is extracted.
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 6/18 step of fsck. Traverse TNC and construct files. There
could be following steps and possible errors:
Step 1. Traverse TNC, check whether the leaf node is valid, remove invalid
nodes, construct file for valid node and insert file into file tree.
a. corrupted node searched from TNC: remove corresponding TNC branch for
danger mode and normal mode with 'yes' answer, other modes will exit.
b. corrupted index node read from TNC: danger mode with rebuild_fs and
normal mode with 'yes' answer will turn to rebuild filesystem, other
modes will exit.
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 3/18 step of fsck. Handle orphan nodes, update TNC & LPT.
There could be following steps and possible errors:
Step 1. scan orphan LEB, get all orphan nodes
a. corrupted scanning data in orphan area: danger mode and normal mode
with 'yes' answer will drop orphan LEB, other modes will exit.
Step 2. parse orphan node, find the original inode for each inum
a. corrupted node searched from TNC: skip node for danger mode and
normal mode with 'yes' answer, other modes will exit.
b. corrupted index node read from TNC: danger mode with rebuild_fs and
normal mode with 'yes' answer will turn to rebuild filesystem, other
modes will exit.
Step 4. remove inode for each inum, update TNC & LPT
a. corrupted index node read from TNC: danger mode with rebuild_fs and
normal mode with 'yes' answer will turn to rebuild filesystem, other
modes will exit.
b. corrupted lpt: Set %FR_LPT_CORRUPTED for lpt status. Ignore the
error.
c. incorrect lpt: Set %FR_LPT_INCORRECT for lpt status. Ignore the
error.
d. If lpt status is not empty, skip updating lpt.
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 2/18 step of fsck. Replay journal, update TNC & LPT.
There could be following steps and possible errors:
Step 1. scan log LEB, get all bud LEBs
a. corrupted scanning data in log area: danger mode with rebuild_fs and
normal mode with 'yes' answer will turn to rebuild filesystem, other
modes will exit.
Step 2. scan bud LEBs, get all nodes
a. corrupted scanning data in bud LEB: danger mode and normal mode with
'yes' answer will drop bud LEB and set %FR_LPT_INCORRECT for lpt
status, other modes will exit.
Step 3. apply nodes, record latest isize into size_tree
Step 4. apply nodes, update TNC & LPT
a. corrupted data searched from TNC: skip node and set %FR_LPT_INCORRECT
lpt status for danger mode and normal mode with 'yes' answer, other
modes will exit.
b. corrupted index node read from TNC: danger mode with rebuild_fs and
normal mode with 'yes' answer will turn to rebuild filesystem, other
modes will exit.
c. corrupted lpt: Set %FR_LPT_CORRUPTED for lpt status. Ignore the
error.
d. incorrect lpt: Set %FR_LPT_INCORRECT for lpt status. Ignore the
error.
e. If lpt status is not empty, skip updating lpt.
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 1/18 step of fsck. Read and check master node, init lpt.
There could be following errors:
1. corrupted scanning data in master area or invalid master node:
danger mode with rebuild_fs and normal mode with 'yes' answer will
turn to rebuild filesystem, other modes will exit.
2. incorrect space statistics in master node: Set %FR_LPT_INCORRECT for
for lpt status. Ignore the error.
3. corrupted lpt: Set %FR_LPT_CORRUPTED for lpt status. Ignore the error.
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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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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