ext4: add ext4_sb_bread() to disambiguate ENOMEM cases

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Today, when sb_bread() returns NULL, this can either be because of an
I/O error or because the system failed to allocate the buffer.  Since
it's an old interface, changing would require changing many call
sites.

So instead we create our own ext4_sb_bread(), which also allows us to
set the REQ_META flag.

Also fixed a problem in the xattr code where a NULL return in a
function could also mean that the xattr was not found, which could
lead to the wrong error getting returned to userspace.

Fixes: ac27a0ec11 ("ext4: initial copy of files from ext3")
Cc: stable@kernel.org # 2.6.19
Signed-off-by: Theodore Ts'o <tytso@mit.edu>

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This commit is contained in:

Theodore Ts'o 2018-11-25 17:20:31 -05:00

parent 2e6e902d18

commit fb265c9cb4

5 changed files with 115 additions and 94 deletions

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2

fs/ext4/ext4.h

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36

fs/ext4/migrate.c

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72

fs/ext4/resize.c

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23

fs/ext4/super.c

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76

fs/ext4/xattr.c

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